- Nickel-promoted oxidative domino Csp3-H/N-H bond double-isocyanide insertion reaction to construct pyrrolin-2-ones
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The first nickel-catalyzed oxidative domino Csp3-H/N-H double isocyanide insertion reaction of acetamides with isocyanides has been developed for the synthesis of pyrrolin-2-one derivatives. A wide range of acetamides bearing various functional groups are compatible with this reaction system by utilizing Ni(acac)2as a catalyst. In this transformation, isocyanide could serve as a C1 connector and insert into the inactive Csp3-H bond, representing an effective way to construct heterocycles.
- Wen, Li-Rong,Wang, Ning-Ning,Du, Wu-Bo,Ma, Qiang,Zhang, Lin-Bao,Li, Ming
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supporting information
p. 2895 - 2900
(2021/04/14)
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- Identification of Novel Fused Heteroaromatics-Based MALT1 Inhibitors by High-Throughput Screening to Treat B Cell Lymphoma
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Development of mucosa-associated lymphoid tissue lymphoma translocation protein 1 (MALT1) inhibitors is of great value and significance in the treatment of neoplastic disorders and inflammatory and autoimmune diseases. However, there is a lack of effective MALT1 inhibitors in clinic. Herein, a novel class of potent 5-oxo-1-thioxo-4,5-dihydro-1H-thiazolo[3,4-a]quinazoline-based MALT1 inhibitors and their covalent derivatives were first identified and designed through high-throughput screening. We demonstrated that compounds 15c, 15e, and 20c effectively inhibited the MALT1 protease and displayed selective cytotoxicity to activated B cell-like diffuse large B cell lymphoma with low single-digit micromolar potency. Furthermore, compound 20c specifically repressed NF-κB signaling and induced cell apoptosis in MALT1-dependent TMD8 cells in a dose-dependent manner. More importantly, 20c showed good pharmacokinetic properties and antitumor efficacy with no significant toxicity in the TMD8 xenograft tumor model. Collectively, this study provides valuable lead compounds of MALT1 inhibitors for further structural optimization and antitumor mechanism study.
- Liang, Xuewu,Sun, Chenxia,Li, Chunpu,Yu, Haolan,Wei, Xiaohui,Liu, Xuyi,Bao, Wei,Shi, Yuqiang,Sun, Xiaochen,Khamrakulov, Mirzadavlat,Yang, Chenghua,Liu, Hong
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p. 9217 - 9237
(2021/07/20)
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- New pyrazolopyrimidine derivatives with anticancer activity: Design, synthesis, PIM-1 inhibition, molecular docking study and molecular dynamics
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In this study, new pyrazolopyrimidine derivatives were designed and evaluated for anticancer activity. PIM-1 inhibitiory activity were measured for the most potent compounds. Molecular docking study and molecular dynamics were also done. Thus, the novel derivatives of pyrazolo[1,5-a]pyrimidine have been synthesized and characterized using different spectroscopic techniques. HMBC and NOESY experiments were used to confirm regiospecific structure of pyrimidine ring. The newly synthesized derivatives were evaluated for their antitumor activities against HCT-116 and MCF-7 cell lines. These derivatives showed clear in vitro antitumor activities. Compound 5h showed the highest bioactivity (IC50 = 1.51 μM) against HCT-116 cell line. While, compound 6c was the most potent derivative, its IC50 was 7.68 μM against MCF-7 cell line. Compounds 5c, 5g, 5h, 6a and 6c showed PIM-1 inhibitory activity with IC50 of 1.26, 0.95, 0.60, 1.82, 0.67, respectively μM that could be correlated with their cytotoxic effect. Molecular docking study was done to predict the mode of binding of the target compounds inside PIM-1 active site. The molecular dynamic simulation was conducted in order to evaluate stability of binding of the tested compounds.
- Hassan, Marwa H. A.,Kamel, Gehan,Khedr, Mohammed A.,Lamie, Phoebe F.,Philoppes, John N.
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- Agonist-mediated switching of ion selectivity in TPC2 differentially promotes lysosomal function
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Ion selectivity is a defining feature of a given ion channel and is considered immutable. Here we show that ion selectivity of the lysosomal ion channel TPC2, which is hotly debated (Calcraft et al., 2009; Guo et al., 2017; Jha et al., 2014; Ruas et al., 2015; Wang et al., 2012), depends on the activating ligand. A high-throughput screen identified two structurally distinct TPC2 agonists. One of these evoked robust Ca2+-signals and non-selective cation currents, the other weaker Ca2+-signals and Na+-selective currents. These properties were mirrored by the Ca2+- mobilizing messenger, NAADP and the phosphoinositide, PI(3,5)P2, respectively. Agonist action was differentially inhibited by mutation of a single TPC2 residue and coupled to opposing changes in lysosomal pH and exocytosis. Our findings resolve conflicting reports on the permeability and gating properties of TPC2 and they establish a new paradigm whereby a single ion channel mediates distinct, functionally-relevant ionic signatures on demand.
- Gerndt, Susanne,Chen, Cheng-Chang,Chao, Yu-Kai,Yuan, Yu,Burgstaller, Sandra,Rosato, Anna Scotto,Krogsaeter, Einar,Urban, Nicole,Jacob, Katharina,Nguyen, Ong Nam Phuong,Miller, Meghan T.,Keller, Marco,Vollmar, Angelika M.,Gudermann, Thomas,Zierler, Susanna,Schredelseker, Johann,Schaefer, Michael,Biel, Martin,Malli, Roland,Wahl-Schott, Christian,Bracher, Franz,Patel, Sandip,Grimm, Christian
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- Co-sensitization of the HD-2 complex with low-cost cyanoacetanilides for highly efficient DSSCs
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The photophysical and electrochemical properties of new targeted 2-cyanoacetanilide-based dyes are illustrated. New cyanoacetanilides SA7-10 were synthesized and employed as co-sensitizers in DSSCs. The chemical structures of these 2-cyanoacetanilides differ according to the substituent at the benzene ring (-H,-Me,-OMe and-NEt2), with the anchoring moiety being the same, a-COOH group. Furthermore, a density functional theory (DFT) calculation has shown an effective intermolecular charge transfer character, the HOMOs of SA7-10 are mainly located on the corresponding donor part, and their LUMOs are located on carboxylic acid moieties as the acceptor. Interestingly, using photosensitizers SA7-10 as co-sensitizers with HD-2 dye causes an improvement in their photovoltaic performances. Among the dyes, SA10 co-sensitized with HD-2 displayed an overall efficiency of 8.25%, a JSC of 19.5 mA cm-2, a VOC of 0.65 V and an FF of 64.35 compared to 7.46%, 19 mA cm-2, 0.64 V and 60.54, respectively, of HD-2 only. Moreover, the electrochemical impedance spectroscopy (EIS) data of SA7-10 and HD-2 were found to be in accordance with the obtained photovoltaic parameters. Finally, the results indicated that 2-cyanoacetanilide-based dyes were utilized as promising co-sensitizers due to their easy preparation methods and their relatively small size.
- Elmorsy, Mohamed R.,Lyu, Luping,Su, Rui,Abdel-Latif, Ehab,Badawy, Safa A.,El-Shafei, Ahmed,Fadda, Ahmed A.
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p. 281 - 288
(2020/03/03)
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- Synthesis, anti-varicella-zoster virus and anti-cytomegalovirus activity of 4,5-disubstituted 1,2,3-(1H)-triazoles
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Background: Clinical drugs for herpesvirus exhibit high toxicity and suffer from significant drug resistance. The development of new, effective, and safe anti-herpesvirus agents with different mechanisms of action is greatly required. Objective: Novel inhibitors against herpesvirus with different mechanisms of action from that of clinical drugs. Methods: A series of novel 5-(benzylamino)-1H-1,2,3-triazole-4-carboxamides were efficiently synthesized and EC50 values against Human Cytomegalovirus (HCMV), Varicella-Zoster Virus (VZV) and Herpes Simplex Virus (HSV) were evaluated in vitro. Results: Some compounds present antiviral activity. Compounds 5s and 5t are potent against both HCMV and VZV. Compounds 5m, 5n, 5s, and 5t show similar EC50 values against both TK+ and TK? VZV strains. Conclusion: 5-(Benzylamino)-1H-1, 2,3-triazole-4-carboxamides are active against herpesviruses and their activity is remarkably affected by the nature and the position of substituents in the benzene ring. The results indicate that these derivatives are independent of the viral thymidine kinase (TK) for activation, which is indispensable for current drugs. Their mechanisms of action may differ from those of the clinic anti-herpesvirus drugs.
- Yuan, Wei-Yuan,Chen, Xue,Liu, Ning-Ning,Wen, Yi-Ning,Yang, Bei,Andrei, Graciela,Snoeck, Robert,Xiang, Yu-Hong,Wu, Yong-Wei,Jiang, Zhen,Schols, Dominique,Zhang, Zhuo-Yong,Wu, Qin-Pei
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p. 801 - 812
(2019/11/02)
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- Structure-based design, synthesis and biological evaluation of a newer series of pyrazolo[1,5-a]pyrimidine analogues as potential anti-tubercular agents
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In-depth study of structure-based drug designing can provide vital leads for the development of novel, clinically active molecules. In this present study, twenty six novel pyrazolo[1,5-a]pyrimidine analogues (6a-6z) were designed using molecular docking studies. The designed molecules were synthesized in good yields. Structural elucidation of the synthesized molecules was carried out using IR, MS, 1H NMR and 13C NMR spectroscopy. All the synthesized compounds were evaluated for their in-vitro anti-tubercular activity against H37Rv strain by Alamar Blue assay method. Most of the synthesized compounds displayed potent anti-tubercular activities. Amongst all the tested compounds 6p, 6g, 6n and 6h exhibited promising anti-tubercular activity. Further, these potent compounds were gauged for MDR-TB, XDR-TB and cytotoxic study. None of these compounds exhibited potent cytotoxicity. Stability of protein ligand complex was further evaluated by molecular dynamics simulation for 10 ns. All these results indicate that the synthesized compounds could be potential leads for further development of new potent anti-tubercular agents.
- Modi, Palmi,Patel, Shivani,Chhabria, Mahesh
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p. 240 - 251
(2019/03/26)
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- Synthesis, characterization, and docking studies of novel cyanopyridone analogs with serotonin 5-HT1B receptor agonists
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The medications in use for treating migraine are directed either towards inhibiting the characteristic migraine pain or towards preventing it from occurring. In this pursuit, ergotamine and sumatriptan class of 5-HT1B receptor agonists have been proved to be extremely effective. Further research into this field led us to design cyanopyridone derivatives that were synthesized through cyclization of 2-cyano-N-phenylacetamides with malonitrile and 2,3-dihydrobenzo[b][1,4]dioxine-6-carbaldehyde. The synthesized cyanopyridones analogs, when docked with active site of 5-HT1B receptor, showed better binding affinity compared to standard antimigraine medications. Additionally, in silico ADME prediction for drug-likeness and pharmacokinetics revealed that all compounds are safer and can be used as antimigraine medicine. The structure of the synthesized compounds has been elucidated on the basis of spectral analysis.
- Baitha, Amresh,Upadhyay, Manish,Gopinathan, Ajay,Krishnan, Karthik,Dabholkar, Vijay V.
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supporting information
p. 844 - 851
(2019/03/26)
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- Identification of some novel pyrazolo[1,5-a]pyrimidine derivatives as InhA inhibitors through pharmacophore-based virtual screening and molecular docking
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The InhA inhibitors play key role in mycolic acid synthesis by preventing the fatty acid biosynthesis pathway. In this present article, Pharmacophore modelling and molecular docking study followed by in silico virtual screening could be considered as effective strategy to identify newer enoyl-ACP reductase inhibitors. Pyrrolidine carboxamide derivatives were opted to generate pharmacophore models using HypoGen algorithm in Discovery studio 2.1. Further it was employed to screen Zinc and Minimaybridge databases to identify and design newer potent hit molecules. The retrieved newer hits were further evaluated for their drug likeliness and docked against enoyl acyl carrier protein reductase. Here, novel pyrazolo[1,5-a]pyrimidine analogues were designed and synthesized with good yields. Structural elucidation of synthesized final molecules was perform through IR, MASS, 1H-NMR, 13C-NMR spectroscopy and further tested for its in vitro anti-tubercular activity against H37Rv strain using Microplate Alamar blue assay (MABA) method. Most of the synthesized compounds displayed strong anti-tubercular activities. Further, these potent compounds were gauged for MDR-TB, XDR-TB and cytotoxic study.
- Modi, Palmi,Patel, Shivani,Chhabria, Mahesh T.
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p. 1736 - 1749
(2018/05/14)
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- Synthesis, cytotoxic characterization, and SAR study of imidazo[1,2-b]pyrazole-7-carboxamides
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The synthesis and in vitro cytotoxic characteristics of new imidazo[1,2-b]pyrazole-7-carboxamides were investigated. Following a hit-to-lead optimization exploiting 2D and 3D cultures of MCF-7 human breast, 4T1 mammary gland, and HL-60 human promyelocytic leukemia cancer cell lines, a 67-membered library was constructed and the structure–activity relationship (SAR) was determined. Seven synthesized analogues exhibited sub-micromolar activities, from which compound 63 exerted the most significant potency with a remarkable HL-60 sensitivity (IC50 = 0.183 μM).
- Demjén, András,Alf?ldi, Róbert,Angyal, Anikó,Gyuris, Márió,Hackler, László,Szebeni, Gábor J.,W?lfling, János,Puskás, László G.,Kanizsai, Iván
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- Synthesis and biological evaluation of 2-acetamidothiophene-3-carboxamide derivatives against Leishmania donovani
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A high-throughput (HTS) and high-content screening (HCS) campaign of a commercial library identified 2-acetamidothophen-3-carboxamide as a novel scaffold for developing new anti-leishmanial agents. A series of chemical modifications were performed to study the structure-activity relationship (SAR) and in vitro anti-leishmanial activities were evaluated using biological assays of not only extracellular promastigotes but also intracellular amastigotes. Compound 6a showed promising anti-amastigote activity (EC50 = 6.41 μM) against L. donovani without any cytotoxicity (CC50 > 50 μM) towards human macrophages.
- Oh, Sangmi,Kwon, Bosung,Kong, Sunju,Yang, Gyongseon,Lee, Nakyung,Han, Dawoon,Goo, Junghyun,Siqueira-Neto, Jair L.,Freitas-Junior, Lucio H.,Liuzzi, Michel,Lee, Jinhwa,Song, Rita
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supporting information
p. 142 - 146
(2014/03/21)
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- Promiscuity and selectivity in covalent enzyme inhibition: A systematic study of electrophilic fragments
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Covalent ligand-target interactions offer significant pharmacological advantages. However, off-target reactivity of the reactive groups, which usually have electrophilic properties, must be minimized, and the selectivity of irreversible inhibitors is a crucial requirement. We therefore performed a systematic study to determine the selectivity of several electrophilic groups that can be used as building blocks for covalently binding ligands. Six reactive groups with modulated electrophilicity were combined with 11 nonreactive moieties, resulting in a small combinatorial library of 72 fragment-like compounds. These compounds were screened against a group of 11 enzyme targets to assess their selectivity and their potential for promiscuous binding to proteins. The assay results showed a considerably lower degree of promiscuity than initially expected, even for those members of the screening collection that contain supposedly highly reactive electrophiles.
- J?st, Christian,Nitsche, Christoph,Scholz, Therese,Roux, Lionel,Klein, Christian D.
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supporting information
p. 7590 - 7599
(2014/12/11)
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- A simple and general approach for the synthesis of highly functionalized 6-oxo-1,6-dihydropyridines
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A variety of 5-cyano-4-methylthio-6-oxo-1,6-dihydropyridine-3-carboxylates have been efficiently synthesized in a one-pot reaction from N-alkyl and N-aryl derivatives of 2-cyano-3,3-bis(methylthio)acrylamides and selected β-keto esters. The reaction proceeds via potassium hydrogen carbonate mediated conjugate addition of a β-keto ester to 2-cyano-3,3-bis(methylthio) acrylamide followed by loss of methyl mercaptan and subsequent intramolecular condensation of amide group with the acyl carbonyl group. The mechanism of the reaction has been established by isolation of the 2-acetyl-4-cyano-5-amino-3- (methylthio)-5-oxopent-3-enoate intermediate and its independent cyclization to the desired 6-oxo-1,6-dihydropyridine.
- Kumar, Sukeerthi,Thakur, Rajni R.,Margal, Sanjay R.,Thomas, Abraham
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supporting information
p. 5112 - 5118
(2013/06/27)
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- Synthesis of some substituted isoxazolo [5,4-d] pyrimidine-4(5H)-ones and their biological evaluation
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Substituted anilines vk'ere condensed Wiih ethyl cyanoacetate in xylene to get corresponding 2-cyano-N-phenylacetamides 1a-1h, which upon reaction with sodium bicarbonate and acetic anhydride gave corresponding compounds 2-cyano-3-hydroxy-N-phenylbut-2-enamides 2a-2h, which further upon reaction with hydroxyl amine hydrochloride in methanol yielded corresponding 5-amino-3-methyl-N-phenylisoxazole-4-carboxamides 3a-3h. 3a-3h when treated with acetic anhydride and triethyl orthoformate, gave substituted isoxazolo [5,4-d] pyrimidin-4 (5H)-ones 4a-4h.
- Godhani,Kaila,Sanghani,Dobariya
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p. 225 - 228
(2013/09/24)
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- The synthesis and biological evaluation of some caffeic acid amide derivatives: E-2-Cyano-(3-substituted phenyl)acrylamides
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A series of caffeic acid amide derivatives 2-cyano-(3-substituted phenyl)acrylamides were synthesized via Knoevenogal condensation of substituted benzaldehydes with cyanoacetamides. The structure of compound 1f was determined as E-isomer by X-ray diffractive analysis. The biological screening tests in vitro showed that compound 1b has obvious inhibitory activities against human gastric carcinoma cell line BGC-823, human nasopharyngeal carcinoma cell line KB and human hepatoma cell line BEL-7402 with IC50 values of 5.6 μg/mL, 13.1 μg/mL and 12.5 μg/mL, respectively. Some preliminary structure-activity relationships (SAR) were also proposed which may provide a direction for further study.
- Zhou, Wei,Li, Hai-bo,Xia, Chun-nian,Zheng, Xian-ming,Hu, Wei-xiao
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experimental part
p. 1861 - 1865
(2009/11/30)
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- Rapid microwave-assisted solution phase synthesis of substituted 2-pyridone libraries
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2-Pyridone and 2-quinolone analogues are well-known biologically active heterocyclic scaffolds. Libraries of 3,5,6-substituted 2-pyridone derivatives are generated by rapid microwave assisted solution phase methods using a one-pot, two-step protocol. The three-component condensation of CH-acidic carbonyl compounds, N,N-dimethylformamide dimethylacetal and methylene active nitriles, leads to 2-pyridones and fused analogues in moderate to good overall yields and high purities. The proposed mechanism of this novel multi-component reaction, structure elucidation of products and intermediates are discussed.
- Gorobets, Nikolay Yu.,Yousefi, Behrooz H.,Belaj, Ferdinand,Kappe, C. Oliver
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p. 8633 - 8644
(2007/10/03)
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- Synthesis, structure-activity relationships, and pharmacokinetic properties of dihydroorotate dehydrogenase inhibitors: 2-cyano-3-cyclopropyl- 3-hydroxy. N-[3'-methyl-4'-(trifluoromethyl)phenyl]propenamide and related compounds
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The active metabolite (2) of the novel immunosuppressive agent leflunomide (1) has been shown to inhibit the enzyme dihydroorotate dehydrogenase (DHODH). This enzyme catalyzes the fourth step in de novo pyrimidine biosynthesis. A series of analogues of the active metabolite 2 have been synthesized. Their in vivo biological activity determined in rat and mouse delayed type hypersensitivity has been found to correlate well with their in vitro DHODH potency. The most promising compound (3) has shown activity in rat and mouse collagen (II)-induced arthritis models (ED50 = 2 and 31 mg/kg, respectively) and has shown a shorter half-life in man when compared with leflunomide. Clinical studies in rheumatoid arthritis are in progress.
- Kuo, Elizabeth A.,Hambleton, Philip T.,Kay, David P.,Evans, Phillip L.,Matharu, Saroop S.,Little, Edward,McDowall, Neil,Jones, C. Beth,Hedgecock, Charles J. R.,Yea, Christopher M.,Chan, A. W. Edith,Hairsine, Peter W.,Ager, Ian R.,Tully, W. Roger,Williamson, Richard A.,Westwood, Robert
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p. 4608 - 4621
(2007/10/03)
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