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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
2-(5-oxo-5H-chroMeno[2,3-b]pyridin-7-yl)propanoic acid 2-(5-oxo-5H-chroMeno[2,3-b]pyridin-7-yl)propanoic acid 52549-19-6 C15H11NO4
1H-BenziMidazole, 2-[[[3-Methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinyl]Methyl]sulfinyl]-1-(2,2,2-trifluoroethyl)- 1H-BenziMidazole, 2-[[[3-Methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinyl]Methyl]sulfinyl]-1-(2,2,2-trifluoroethyl)- 1187926-84-6 C18H15F6N3O2S
4,5-dihydro-a-(hydroxyMethyl)-a,3-diMethyl-5-oxo-1-phenyl-1H-Pyrazole-4-Methanesulfonic acid 4,5-dihydro-a-(hydroxyMethyl)-a,3-diMethyl-5-oxo-1-phenyl-1H-Pyrazole-4-Methanesulfonic acid 1242471-40-4 C13H16N2O5S
16α,17-[(1RS)-Butylidenebis(oxy)]-11β-hydroxy-17-(hydroxyMethyl)-D-hoMoandrosta-1,4-diene-3,17a-dione (Mixture of DiastereoMers) 16α,17-[(1RS)-Butylidenebis(oxy)]-11β-hydroxy-17-(hydroxyMethyl)-D-hoMoandrosta-1,4-diene-3,17a-dione (Mixture of DiastereoMers) 1040085-99-1 C25H34O6
2-BroMo-1-cyclopropyl-2-(3-fluorophenyl)ethanone 2-BroMo-1-cyclopropyl-2-(3-fluorophenyl)ethanone 1359829-72-3 C11H10BrFO
N-((4-(5-Methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)acetaMide N-((4-(5-Methyl-3-phenylisoxazol-4-yl)phenyl)sulfonyl)acetaMide 198471-06-6 C18H16N2O4S
N-((S)-1-(((S)-1-Hydroxy-3-Methylbutyl)aMino)-1-oxo-3-phenylpropan-2-yl)pyrazine-2-carboxaMide N-((S)-1-(((S)-1-Hydroxy-3-Methylbutyl)aMino)-1-oxo-3-phenylpropan-2-yl)pyrazine-2-carboxaMide 289472-81-7 C19H24N4O3
(Z)-N-(2-nitrovinyl)acetaMide (Z)-N-(2-nitrovinyl)acetaMide 1238305-24-2 C4H6N2O3
Azilsartan iMpurity Azilsartan iMpurity 1604812-35-2 C35H28N4O11
Azilsartan iMpurity N Azilsartan iMpurity N 2244031-86-3 C22H17N3O4
cefoxitin iMpurity B cefoxitin iMpurity B
pidotiMod iMpurity A pidotiMod iMpurity A
Rivaroxaban iMpurity A Rivaroxaban iMpurity A 931204-39-6 C19H20ClN3O6S
R-7H-Pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid, 9-fluoro-2,3-dihydro-3-Methyl-10-(4-Methyl-1-piperazinyl)-7-oxo- Methyl ester R-7H-Pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic acid, 9-fluoro-2,3-dihydro-3-Methyl-10-(4-Methyl-1-piperazinyl)-7-oxo- Methyl ester 1268719-66-9 C19H22FN3O4
Ticagrelor Sulfone Ticagrelor Sulfone 274693-39-9 C23H28F2N6O6S
2-(((3aR,4S,6R,6aS)-6-(7-aMino-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-2,2-diMethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl)oxy)ethanol 2-(((3aR,4S,6R,6aS)-6-(7-aMino-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-2,2-diMethyltetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl)oxy)ethanol 1858267-99-8 C17H26N6O4S
(2R,3R)-2-[(1R)-1-[3,5-Bis(trifluoroMethyl)phenyl]ethoxy]-3-(4-fluorophenyl)Morpholine (2R,3R)-2-[(1R)-1-[3,5-Bis(trifluoroMethyl)phenyl]ethoxy]-3-(4-fluorophenyl)Morpholine 380499-06-9 C20H18F7NO2
Adefovir iMpurity Adefovir iMpurity 1875153-79-9 C15H24N5O6P
3-OXO-3,4-DIHYDROPYRAZINE-2-CARBONITRILE 3-OXO-3,4-DIHYDROPYRAZINE-2-CARBONITRILE 81411-78-1 C5H3N3O
RP 48497 (Eszopiclone Impurity C) RP 48497 (Eszopiclone Impurity C) 148891-53-6 C11H7ClN4O
3-(1-methyl-1H-indole-3-carbonyl)hexanedioic acid 3-(1-methyl-1H-indole-3-carbonyl)hexanedioic acid 1352491-75-8 C16H17NO5
Decladinose Roxithromycin (Roxithromycin Impurity B) Decladinose Roxithromycin (Roxithromycin Impurity B) 214902-82-6 C33H62N2O12
Unii-o0p4I5851i Unii-o0p4I5851i 139563-29-4 C28H37ClN4O2S
Amoxicillin Diketopiperazine (Mixture of Diastereomers) Amoxicillin Diketopiperazine (Mixture of Diastereomers) 94659-47-9 C16H19N3O5S
Atorvastatin Oxirane Impurity Atorvastatin Oxirane Impurity 1246818-88-1 C26H24FNO3
Dehydro Lovastatin Dehydro Lovastatin 109273-98-5 C24H34O4
(3S)-3-[3-[(1E)-2-(7-Chloro-2-quinolinyl)ethenyl]phenyl]-4,5-dihydro-2-benzoxepin-1(3H)-one (3S)-3-[3-[(1E)-2-(7-Chloro-2-quinolinyl)ethenyl]phenyl]-4,5-dihydro-2-benzoxepin-1(3H)-one 1100617-38-6 C27H20ClNO2
O-Desethyl N-Trityl Candesartan Cilexetil O-Desethyl N-Trityl Candesartan Cilexetil 934495-65-5 C50H44N6O6
(R)-(+)-Tolvaptan (R)-(+)-Tolvaptan 331947-66-1 C26H25ClN2O3
Anastrozole iMpurity Anastrozole iMpurity
LevosiMendan iMpurity LevosiMendan iMpurity 139052-02-1
(Z)-3-((2'-(N'-hydroxycarbaMiMidoyl)biphenyl-4-yl)Methyl)-2-oxo-2,3-dihydro-1H-benzo[d]iMidazole-4-carboxylic acid (Z)-3-((2'-(N'-hydroxycarbaMiMidoyl)biphenyl-4-yl)Methyl)-2-oxo-2,3-dihydro-1H-benzo[d]iMidazole-4-carboxylic acid 1174733-90-4 C10H14N4O6
rac Cinacalcet HCl rac Cinacalcet HCl 1025064-33-8 C22H22F3N
Acyclovir IMpurity I Acyclovir IMpurity I
AtracuriuM Besylate IMpurity D Iodide (Mixture of DiastereoMers) AtracuriuM Besylate IMpurity D Iodide (Mixture of DiastereoMers)
AzithroMycin IMpurity D AzithroMycin IMpurity D
AztreonaM IMpurity E AztreonaM IMpurity E
Dasatinib IMpurity 1 Dasatinib IMpurity 1
Deferasirox IMpurity 1 Deferasirox IMpurity 1
Doxycycline Hyclate IMpurity F Doxycycline Hyclate IMpurity F 122861-53-4 C23H25NO8
IpratropiuM BroMide IMpurity E IpratropiuM BroMide IMpurity E 183626-76-8 C19H27NO3
Minoxidil IMpurity D Minoxidil IMpurity D 75105-16-7 C11H12N4O4S
Ribavirin IMp. D (EP) Ribavirin IMp. D (EP)
SalMeterol IMpurity C SalMeterol IMpurity C C25H37NO4
SulbactaM IMpurity F SulbactaM IMpurity F
N-(4-(2-Methyl-1,4,5,6-tetrahydrobenzo[b]iMidazo[4,5-d]azepine-1-carbonyl)phenyl)-[1,1'-biphenyl]-2-carboxaMide N-(4-(2-Methyl-1,4,5,6-tetrahydrobenzo[b]iMidazo[4,5-d]azepine-1-carbonyl)phenyl)-[1,1'-biphenyl]-2-carboxaMide C32H26N4O2
1-(4-Methoxyphenyl)-6-(4-(2-Methyl-6-oxopiperidin-1-yl)phenyl)-7-oxo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxaMide 1-(4-Methoxyphenyl)-6-(4-(2-Methyl-6-oxopiperidin-1-yl)phenyl)-7-oxo-4,5,6,7-tetrahydro-1H-pyrazolo[3,4-c]pyridine-3-carboxaMide 2098457-92-0 C26H27N5O4
Epalrestat iMpurity Epalrestat iMpurity 109801-00-5 C13H18O
5-Oxo Pitavastatin 5-Oxo Pitavastatin 222306-15-2 C25H22FNO4
(3R)-2,3-Dihydro-3-(2-propyn-1-ylaMino)-1H-inden-1-one (3R)-2,3-Dihydro-3-(2-propyn-1-ylaMino)-1H-inden-1-one 1312077-05-6 C12H11NO
1-[[2'-(AMinoiMinoMethyl)[1,1'-biphenyl]-4-yl]Methyl]-2-ethoxy-1H-benziMidazole-7-carboxylic Acid 1-[[2'-(AMinoiMinoMethyl)[1,1'-biphenyl]-4-yl]Methyl]-2-ethoxy-1H-benziMidazole-7-carboxylic Acid 1442400-65-8 C24H22N4O3
2-Hydroxy Cephalexin 2-Hydroxy Cephalexin 215172-75-1 C16H17N3O5S
3-(9H-Carbazol-4-yloxy)-1,2-propanediol 3-(9H-Carbazol-4-yloxy)-1,2-propanediol 123119-89-1 C15H15NO3
4-(2-Methylpropoxy)-1,3-benzenedicarbothioaMide 4-(2-Methylpropoxy)-1,3-benzenedicarbothioaMide 1330632-46-6 C12H16N2OS2
N-(Ethylamino) Fluvoxamine N-(Ethylamino) Fluvoxamine 1217262-11-7 C17H26F3N3O2
Iso Ribavirin (Ribavirin Impurity G) Iso Ribavirin (Ribavirin Impurity G) 39030-43-8 C8H12N4O5
(Z)-Cefdinir (Z)-Cefdinir 178601-88-2 C14H13N5O5S2
Flucloxacillin impurity E Flucloxacillin impurity E
4-(4-Piperidyl)-1-butanol 4-(4-Piperidyl)-1-butanol 57614-92-3 C9H19NO
Pitavastatin Methyl Ester Pitavastatin Methyl Ester 849811-78-5 C26H26FNO4
1-Cyclopropyl-1,4-dihydro-6,8-dimethoxy-7-[(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic acid 1-Cyclopropyl-1,4-dihydro-6,8-dimethoxy-7-[(4aS,7aS)-octahydro-6H-pyrrolo[3,4-b]pyridin-6-yl]-4-oxo-3-quinolinecarboxylic acid 1029364-73-5 C22H27N3O5
3S,5R isoMer, or (3S,5R)-7-[3-(phenylcarbaMoyl)-5-(4-fluorophenyl)-2-isopropyl-4-phenyl-1H-pyrrol-1-yl]-3,5-dihydroxyheptanoic acid calciuM salt 3S,5R isoMer, or (3S,5R)-7-[3-(phenylcarbaMoyl)-5-(4-fluorophenyl)-2-isopropyl-4-phenyl-1H-pyrrol-1-yl]-3,5-dihydroxyheptanoic acid calciuM salt 887196-25-0 C33H34CaFN2O5+
3'-O-(5'-Deoxy-α-D-ribofuranosyl) Capecitabine 3'-O-(5'-Deoxy-α-D-ribofuranosyl) Capecitabine 1262133-64-1 C20H30FN3O9
5-Chlorodescyano CitalopraM Oxalate 5-Chlorodescyano CitalopraM Oxalate 64169-46-6 C21H23ClFNO5
Acyclovir N-Methyl-L-valinate Hydrochloride Acyclovir N-Methyl-L-valinate Hydrochloride 1346617-39-7 C14H23ClN6O4
rac N,N-DidesMethyl-N-(4-hydroxyphenethyl)-O-desMethyl Venlafaxine rac N,N-DidesMethyl-N-(4-hydroxyphenethyl)-O-desMethyl Venlafaxine 1346601-21-5 C22H29NO3
rac-11-Deoxy-8(12)-dehydro Misoprostol rac-11-Deoxy-8(12)-dehydro Misoprostol 1331639-92-9 C22H36O4
5-Nitro-1H-iMidazole-1-ethanol 5-Nitro-1H-iMidazole-1-ethanol 5006-68-8 C5H7N3O3
Hydroxy Adapalene Hydroxy Adapalene 1346599-76-5 C28H28O4
Iohexol related Compound I Iohexol related Compound I
2,2'-Methylene Bis[Ranitidine] 2,2'-Methylene Bis[Ranitidine] 207592-21-0 C27H44N8O6S2
ChloroMethyl Propyl Carbonate ChloroMethyl Propyl Carbonate 35273-90-6 C5H9ClO3
2-AMino-5-(trifluoroMethoxy)phenyl Thiocyanate 2-AMino-5-(trifluoroMethoxy)phenyl Thiocyanate 1391054-04-8 C8H5F3N2OS
Bisacodyl Related Compound B (20 mg) (2,4'-(Pyridin-2-ylmethylene)diphenol) Bisacodyl Related Compound B (20 mg) (2,4'-(Pyridin-2-ylmethylene)diphenol) 16985-05-0 C18H15NO2
Doxepin Related Compound C (25 mg) ((E-3-(dibenzo[b,e]oxepin-11(6H)-ylidene)-N-methylpropan-1-amine hydrochloride) Doxepin Related Compound C (25 mg) ((E-3-(dibenzo[b,e]oxepin-11(6H)-ylidene)-N-methylpropan-1-amine hydrochloride) 4504-96-5 C18H20ClNO
Imiquimod Related Compound B (25 mg) (1-Isobutyl-1H-imidazo[4,5-c]quinoline 5-oxide) Imiquimod Related Compound B (25 mg) (1-Isobutyl-1H-imidazo[4,5-c]quinoline 5-oxide) 99010-63-6 C14H15N3O
Ioversol Related Compound B (50 mg) (N,N'-bis(2,3-dihydroxypropyl)-5-[(N-(2-hydroxyethyl)-carbamoyl)methoxy]-2,4,6-triiodoisophthalamide) Ioversol Related Compound B (50 mg) (N,N'-bis(2,3-dihydroxypropyl)-5-[(N-(2-hydroxyethyl)-carbamoyl)methoxy]-2,4,6-triiodoisophthalamide) 104517-96-6 C18H24I3N3O9
Edoxaban Impurity 12 (1R,2R,4S) Edoxaban Impurity 12 (1R,2R,4S) 500572-10-1 C24H30ClN7O4S
paroxetine Mesylate paroxetine Mesylate 217797-14-3 C20H24FNO6S
Linagliptin Impurity L Linagliptin Impurity L
Linagliptin Impurity S Linagliptin Impurity S 668273-74-3 C30H36N8O4
(R)-2-((6-(3-aminopiperidin-1-yl)-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzonitrile (R)-2-((6-(3-aminopiperidin-1-yl)-2,4-dioxo-3,4-dihydropyrimidin-1(2H)-yl)methyl)-4-fluorobenzonitrile C17H18FN5O2
Olaparib impurity 1 Olaparib impurity 1 763113-06-0 C24H24N4O3
4-Quinazolinamine,N-(3-ethenylphenyl)-6,7-bis(2-methoxyethoxy)-,hydrochloride(1:1) 4-Quinazolinamine,N-(3-ethenylphenyl)-6,7-bis(2-methoxyethoxy)-,hydrochloride(1:1) 1624294-38-7 C22H26ClN3O4
4-Oxiranylmethoxy-benzaldehyde 4-Oxiranylmethoxy-benzaldehyde 14697-49-5 C10H10O3
Alogliptin Related Compound 24 Alogliptin Related Compound 24 1430222-06-2 C14H12ClN3O2
Apremilast Impurity 1 Apremilast Impurity 1
Etoricoxib Impurity 15 Etoricoxib Impurity 15 73312-69-3 C5H8ClNO
Ibrutinib Impurity 1 Ibrutinib Impurity 1
Mirabegron Impurity 13 Mirabegron Impurity 13
Riociguat Impurtiy 4 Riociguat Impurtiy 4
2,3-Dehydrosilybin B 2,3-Dehydrosilybin B 142796-24-5 C25H20O10
Cabozantinib Impurity Cabozantinib Impurity 1355031-15-0 C16H14N2O3
Canagliflozin open-ring impurity Canagliflozin open-ring impurity
Dapoxetine Impurity E Dapoxetine Impurity E
Ilaprazole Impurity Ilaprazole Impurity 1018229-53-2 C11H9N3O
Linagliptin Impurity X Linagliptin Impurity X
Norfloxacin Imp.(EP) Norfloxacin Imp.(EP) 1911573-08-4 C34H52FN3O4
Rocuronium Bromide Impurity Rocuronium Bromide Impurity 13492-57-4 C27H44N2O4
Ruxolitinib Impurity Ruxolitinib Impurity
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