Pharmaceutical Impurity Reference Standards

• Structure
• Product name
• CAS No.
• Molecular formula
• Inquiry

• 
• ethyl 4-(8-chloro-11H-benzo[5,6]cyclohepta[1,2-b]pyridin-11-ylidene)piperidine-1-carboxylate
• 133330-56-0
• C₂₂H₂₁ClN₂O₂
• inquiry

• 4,8-Dichloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-β]pyridin-11-one (Loratadine Impurity)
• 133330-60-6
• C14H9Cl2NO
• inquiry

• 2,8-Dichloro-5,6-dihydro-11H-benzo[5,6]cyclohepta[1,2-β]pyridin-11-one
• 133330-61-7
• C14H9Cl2NO
• inquiry

• 
• 8-Chloro-6,11-Dihydro-11-Hydroxy-5H-Benzo[5,6]-Cyclohepta[1,2-b]Pyridine
• 133330-72-0
• C₁₄H₁₂ClNO
• inquiry

• 
• 1-(4-bromo-3,5-dimethoxyphenyl)ethanone
• 1333472-28-8
• C₁₀H₁₁BrO₃
• inquiry

• Morpholine, 2-[(1S)-1-[3,5-bis(trifluoromethyl)phenyl]ethoxy]-3-(4-fluorophenyl)-, hydrochloride (1:1), (2R,3R)-
• 1333998-21-2
• C20H18F7NO2 . ClH
• inquiry

• 
• PROSTAGLANDIN B1
• 13345-51-2
• C₂₀H₃₂O₄
• inquiry

• 
• 1-Cyanocyclohexaneacetic acid
• 133481-09-1
• C9H13NO2
• inquiry

• 
• Rosuvastatin EP impurity H
• 1335110-44-5
• C₂₂H₂₈FN₃O₆S
• inquiry

• 
• Febuxostat Impurity 14
• 1335202-60-2
• C₁₅H₁₆N₂OS
• inquiry

• 
• 4-pivaloylamino-7-iodo-3H,5H-pyrrolo[3,2-d]pyrimidine
• 1335287-28-9
• C₁₁H₁₃IN₄O
• inquiry

• 
• 4'-(azidomethyl)[1,1'-biphenyl]-2-carbonitrile
• 133690-91-2
• C₁₄H₁₀N₄
• inquiry

• 
• L-Alanine, N-[(S)-hydroxyphenoxyphosphinyl]-, 1-Methylethyl ester, (P→3'),(P'→5')-diester with (2'R)-2'-deoxy-2'-fluoro-2'-Methyluridine
• 1337482-17-3
• C₃₄H₄₅FN₄O₁₃P₂
• inquiry

• 
• (trans)-4-Propyl-1-methyl-L-proline
• 13380-36-4
• C9H17NO2
• inquiry

• Anastrozole IMpurity (alfa1 , alfa1, alfa3, alfa3-TetraMethyl-5-(1H-1,2,4-triazol-1-ylMethyl)-1,3-Benzenediacetic acid)
• 1338800-81-9
• C17H21N3O4
• inquiry

• 
• Trityl losartan
• 133909-99-6
• C41H37ClN6O
• inquiry

• 
• 4-hydroxy-N-furfuryl-5-sulfamoylanthranilic acid
• 133989-65-8
• C₁₂H₁₂N₂O₆S
• inquiry

• 
• 10-FORMYLFOLIC ACID (25 MG)
• 134-05-4
• C20H19N7O7
• inquiry

• 
• Hydroxocobalamin
• 13422-51-0
• C62H89CoN13O15P
• inquiry

• 
• Bis(4-fluorobenzyl)aMine, 97%
• 134227-41-1
• C14H13F2N
• inquiry

• 
• 2-Cyclopentene-1-carboxylicacid,4-amino-,(1S,4R)-(9CI)
• 134234-04-1
• C₆H₉NO₂
• inquiry

• 
• (6R,7R)-benzhydryl (7-(2-difluoromethylthio)acetamido)-3-(chloromethyl)-7-methoxy-8-oxo-5-oxa-1-aza-bicyclo[4,2,0]oct-2-ene-2-carboxylate
• 134237-56-2
• C₂₅H₂₃ClF₂N₂O₆S
• inquiry

• 
• 1,1-dimethylethyl (R)-7-<2-(4-fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-<(phenylamino)carbonyl>-1H-pyrrol-1-yl>-5-hydroxy-3-oxo-1-heptanoate
• 134394-98-2
• C₃₇H₄₁FN₂O₅
• inquiry

• 
• Sitagliptin EP Impurity C
• 1345822-86-7
• C₁₆H₁₆F₅N₅O*H₃O₄P
• inquiry

• 
• Sitagliptin EP Impurity B
• 1345822-87-8
• C₁₆H₁₆F₅N₅O*H₃O₄P
• inquiry

• 
• rac-Clopidogrel-MP Endo Derivative
• 1346598-12-6
• C25H26ClNO6S
• inquiry

• 
• Hydroxy Adapalene
• 1346599-76-5
• C28H28O4
• inquiry

• 
• N-Des(cyclohexylaMinocarbonyl) Glipizide
• 1346600-54-1
• C14H16N4O3S
• inquiry

• 
• N-ForMyl Oxcarbazepine
• 1346601-76-0
• C₁₆H₁₂N₂O₃
• inquiry

• 
• 3-Vinylphenyl ethyl(methyl)-carbamate
• 1346602-84-3
• C₁₂H₁₅NO₂
• inquiry

• ALLOPURINOL IMPURITY C
• 1346604-13-4
• C5H4N4O
• inquiry

• 
• 3-Oxo Rosuvastatin SodiuM Salt
• 1346606-28-7
• C22H25FN3NaO6S
• inquiry

• 2'-[(1E)-2-[4-[[(2-carboxyethyl)aMino]carbonyl]phenyl]diazenyl] Balsalazide
• 1346606-53-8
• C27H24N6O9
• inquiry

• 
• Acyclovir N-Methyl-L-valinate Hydrochloride
• 1346617-39-7
• C14H23ClN6O4
• inquiry

• 
• Acyclovir N-Ethyl-L-valinate Hydrochloride
• 1346617-49-9
• C15H25ClN6O4
• inquiry

• 
• 3(2H)-Pyridazinone, 4,5-dihydro-6-(4-hydroxyphenyl)-5-methyl-, (R)-
• 134678-47-0
• C11H12N2O2
• inquiry

• 
• ent-LaMivudine
• 134680-32-3
• C₈H₁₁N₃O₃S
• inquiry

• 
• BECLOTIAMINE
• 13471-78-8
• C12H16 Cl N4 S . Cl
• inquiry

• 
• Axitinib Impurity a
• 1347304-18-0
• C₂₂H₁₈N₄O₂S
• inquiry

• 
• 4-Amino-1-3,5-di-O-benzoyl-2-deoxy-2,2-difluoro-a-D-erythro-pentofuranosyl)-2(1H)-pyrimidinone
• 134790-40-2
• C23H19F2N3O6
• inquiry

• 
• (S)-4-(TERT-BUTOXY)-2-ISOPROPYL-4-OXOBUTANOIC ACID
• 134807-43-5
• C₁₁H₂₀O₄
• inquiry

• Axitinib Impurity b
• 1348536-59-3
• inquiry

• 
• 2-Deoxy-2,2-difluoro-D-ribofuranose-3,5-dibenzoate-1-methanesulfonate
• 134877-42-2
• C20H18F2O8S
• inquiry

• 
• 4-(hydroxyamino)-1-pentofuranosylpyrimidin-2(1H)-one
• 13491-41-3
• C9H13N3O6
• inquiry

• 
• TRANS-2-PHENYLCYCLOPROPYLAMINE HEMISULFATE SALT
• 13492-01-8
• 2C₉H₁₁N*H₂O₄S
• inquiry

• 
• TF-A
• 134965-85-8
• C₁₂H₇ClN₆
• inquiry

• 
• 17,21-dihydroxy-16beta-methylpregna-1,4,9(11)-triene-3,20-dione
• 13504-15-9
• C22H28 O4
• inquiry

• 
• Febuxostat Acyl-β-D-glucuronide
• 1351692-92-6
• C22H24N2O9S
• inquiry

• 
• (2S,20S,21S,22R,23R,24R,25S,26R,27S)-6,21,23-trihydroxy-27-methoxy-2,4,16,20,22,24,26-heptamethyl-11-methylene-1,5,15-trioxo-1,2,5,11-tetrahydro-2,7-(epoxypentadeca[1,11,13]trienoimino)furo[2'',3'':7',8']naphtho[1',2':4,5]imidazo[1,2-a]pyridin-25-yl acetate
• 1351775-04-6
• C₄₃H₄₉N₃O₁₁
• inquiry

• 
• C₁₄H₂₆N₂O₄*ClH
• 1352062-19-1
• C₁₄H₂₆N₂O₄*ClH
• inquiry