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203053-99-0

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203053-99-0 Usage

Check Digit Verification of cas no

The CAS Registry Mumber 203053-99-0 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 2,0,3,0,5 and 3 respectively; the second part has 2 digits, 9 and 9 respectively.
Calculate Digit Verification of CAS Registry Number 203053-99:
(8*2)+(7*0)+(6*3)+(5*0)+(4*5)+(3*3)+(2*9)+(1*9)=90
90 % 10 = 0
So 203053-99-0 is a valid CAS Registry Number.

203053-99-0Relevant articles and documents

Synthesis of Peptides and Pseudopeptides Incorporating an endo-(2S,3R)-Norborn-5-ene Residue as a Turn Inducer

Hibbs, David E.,Hursthouse, Michael B.,Jones, Iwan G.,Jones, Wyn,Malik, K.M. Abdul,North, Michael

, p. 1496 - 1504 (2007/10/03)

The desymmetrization of endo-norborn-5-ene-2,3-dicarboxylic anhydride (5) by proline derivatives is used to prepare peptides and pseudopeptides incorporating an endo-(2S,3R)-2-amino-3-carboxynorborn-5-ene (1) residue. The peptides contain a single conformationally constrained β-amino acid residue, while the pseudopeptides also contain a urea linkage and two peptide chains running in parallel directions. The key step in the synthesis is a Curtius rearrangement on the amido acids 6a,b to generate an isocyanate that is then directly reacted with suitably protected amino acids and peptides to give the peptides and pseudopeptides. The synthesis of the peptide analogue 4 is also described; in this compound, the two peptide chains run parallel to one another, and the stereochemistry of the norbornene unit within compound 4 was determined by X-ray analysis of the related peptide analogue 23.

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