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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Difluoro Atorvastatin Difluoro Atorvastatin 693794-20-6 C66H66CaF4N4O10
(4S,trans)-1,1-Dimethylethyl-6-aminoethyl-2,2-dimethyl-1,3-dioxane-4-acetate (4S,trans)-1,1-Dimethylethyl-6-aminoethyl-2,2-dimethyl-1,3-dioxane-4-acetate 1105067-89-7 C14H27NO4
rac 5-Keto Fluvastatin rac 5-Keto Fluvastatin 1160169-39-0 C24H24FNO4
9-Piperazino Ofloxacin 9-Piperazino Ofloxacin 197291-75-1 C18H20FN3O4
Thyroxine-4-hydroxy-3,5-diiodophenyl Ether DISCONTINUED Thyroxine-4-hydroxy-3,5-diiodophenyl Ether DISCONTINUED 911661-90-0 C21H13I6NO5
3-(3-Chloropropyl)-7,8-dimethoxy-2,3,4,5-tetrahydro-1H-3-benzazepin-2-one 3-(3-Chloropropyl)-7,8-dimethoxy-2,3,4,5-tetrahydro-1H-3-benzazepin-2-one 85175-65-1 C15H20ClNO3
N-DesMethyl TelMisartan N-DesMethyl TelMisartan 144701-81-5 C32H28N4O2
N-De[2-(Methylsulfonyl)ethyl] Lapatinib N-De[2-(Methylsulfonyl)ethyl] Lapatinib 697299-82-4 C26H20ClFN4O2
N-[(3,4-DiMethoxy-2-pyridinyl)Methyl] Pantoprazole Sulfide N-[(3,4-DiMethoxy-2-pyridinyl)Methyl] Pantoprazole Sulfide 957470-58-5 C24H24F2N4O5S
3-Oxo Rosuvastatin SodiuM Salt 3-Oxo Rosuvastatin SodiuM Salt 1346606-28-7 C22H25FN3NaO6S
Famciclovir Related Compound A (20 mg) (2-[2-(2-Amino-9H-purin-9-yl)ethyl]propane-1,3-diol hydrochloride) Famciclovir Related Compound A (20 mg) (2-[2-(2-Amino-9H-purin-9-yl)ethyl]propane-1,3-diol hydrochloride) 246021-75-0 C10H16ClN5O2
Olopatadine USP RC B Olopatadine USP RC B 173174-07-7 C21H23NO4
Ramipril Related Compound A (30 mg) ((2S,3aS,6aS)-1-[(S)2-[[(S)-1-(methoxycarbonyl)-3-phenylpropyl]amino]-1-oxopropyl]-octahydrocyclopenta[b]pyrrole-2-carboxylic acid) Ramipril Related Compound A (30 mg) ((2S,3aS,6aS)-1-[(S)2-[[(S)-1-(methoxycarbonyl)-3-phenylpropyl]amino]-1-oxopropyl]-octahydrocyclopenta[b]pyrrole-2-carboxylic acid) 108313-11-7 C22H30N2O5
4-(4-(4-(4-(((3S,5S)-5-((1H-1,2,4-triazol-1-yl)Methyl)-5-(2,4-difluorophenyl)tetrahydrofuran-3-yl)Methoxy)phenyl)piperazin-1-yl)phenyl)-1-((2R,3R)-2-hydroxypentan-3-yl)-1H-1,2,4-triazol-5(4H)-one 4-(4-(4-(4-(((3S,5S)-5-((1H-1,2,4-triazol-1-yl)Methyl)-5-(2,4-difluorophenyl)tetrahydrofuran-3-yl)Methoxy)phenyl)piperazin-1-yl)phenyl)-1-((2R,3R)-2-hydroxypentan-3-yl)-1H-1,2,4-triazol-5(4H)-one 2243785-97-7 C37H42F2N8O4
4-(4-broMo-3-(hydroxyMethyl)phenoxy)benzonitrile 4-(4-broMo-3-(hydroxyMethyl)phenoxy)benzonitrile 906673-45-8 C14H10BrNO2
ACT 080803 ACT 080803 1433875-21-8 C16H13Br2N5O2
L-Alanine, N-[(S)-hydroxyphenoxyphosphinyl]-, 1-Methylethyl ester, (P→3'),(P'→5')-diester with (2'R)-2'-deoxy-2'-fluoro-2'-Methyluridine 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
Pyrido[2,3-d]pyriMidin-7(8H)-one, 2,6-dibroMo-8-cyclopentyl-5-Methyl- Pyrido[2,3-d]pyriMidin-7(8H)-one, 2,6-dibroMo-8-cyclopentyl-5-Methyl- 1415560-29-0 C13H13Br2N3O
Albendazole EP Impurity J Albendazole EP Impurity J 946498-41-5 C9H7Cl2N3O2
Ibrutinib Dimer Impurity Ibrutinib Dimer Impurity 2031255-23-7 C50H48N12O4
Rifaximin EP Impurity H Rifaximin EP Impurity H 1210022-90-4 C43H51N3O12
Voriconazole (2R,3R)-Isomer Voriconazole (2R,3R)-Isomer 137234-76-5 C16H13ClF3N5O
Diquafosol Impurity 12 Diquafosol Impurity 12 694434-51-0 C18H26N4O23P4
Etoricoxib Impurity 39 Etoricoxib Impurity 39 107825-28-5 C13H17NOS2
Furosemide Impurity 7 Furosemide Impurity 7 4753-68-8 C5H8ClNO
1,1'-[1,3-Propanediylbis(oxy)]bis[2,5-dimethylbenzene] 1,1'-[1,3-Propanediylbis(oxy)]bis[2,5-dimethylbenzene] 415724-02-6 C19H24O2
1-Dimethylamino-2-phenylbutan-2-yl 3,4,5-trimethoxybenzoate 1-Dimethylamino-2-phenylbutan-2-yl 3,4,5-trimethoxybenzoate 92414-09-0 C22H29NO5
Celecoxib 2-Methyl Analog Celecoxib 2-Methyl Analog 170569-99-0 C17H14F3N3O2S
EMpagliflozin iMpurity 6 EMpagliflozin iMpurity 6 1620758-21-5 C32H37ClO12
EMpagliflozin iMpurity 11 EMpagliflozin iMpurity 11
1,4,7,10-Tetraazacyclododecane-1,4,7-triacetic acid,10-[2,3-dihydroxy-1-(hydroxymethyl)propyl]- 1,4,7,10-Tetraazacyclododecane-1,4,7-triacetic acid,10-[2,3-dihydroxy-1-(hydroxymethyl)propyl]- 138168-36-2 C18H34N4O9
Di-Norbudesonide (Mixture of DiastereoMers) Di-Norbudesonide (Mixture of DiastereoMers) 1040085-98-0 C23H30O6
Linagliptin MethyldiMer Linagliptin MethyldiMer 1418133-47-7 C50H56N16O4
Trelagliptin Impurity isomer Trelagliptin Impurity isomer 2206135-35-3 C18H20FN5O2
(2R,3R,4R,5S,6R)-2-(4-chloro-3-(4-ethoxybenzyl)phenyl)-6-(hydroxyMethyl)tetrahydro-2H-pyran-3,4,5-triol (2R,3R,4R,5S,6R)-2-(4-chloro-3-(4-ethoxybenzyl)phenyl)-6-(hydroxyMethyl)tetrahydro-2H-pyran-3,4,5-triol C21H25ClO6
3,6-Dichloropyrazine-2-carboxaMide 3,6-Dichloropyrazine-2-carboxaMide 1023813-21-9 C5H3Cl2N3O
N-acetic acid-1-aMino-3-adaMantanol N-acetic acid-1-aMino-3-adaMantanol 1032564-18-3 C12H19NO3
9(10H)-Acridinone, 2-ethoxy-6-nitro- 9(10H)-Acridinone, 2-ethoxy-6-nitro- 451460-48-3 C15H12N2O4
Olaparib iMpurity D Olaparib iMpurity D
(5-broMo-2-chlorophenyl)(4-hydroxyphenyl)Methanone (5-broMo-2-chlorophenyl)(4-hydroxyphenyl)Methanone 1360568-68-8 C13H8BrClO2
(2-broMo-4,5-diMethylphenyl)Methanol (2-broMo-4,5-diMethylphenyl)Methanol 1126385-20-3 C9H11BrO
Posaconazole iMpurity 8 Posaconazole iMpurity 8
LCZ Impurity LCZ Impurity 753421-85-1 C20H25NO2
Dehydro Benidipine Dehydro Benidipine 118935-44-7 C28H29N3O6
Etoposide Impurity B Etoposide Impurity B 100007-56-5 C29H32O13
Istradefylline Impurity 2 Istradefylline Impurity 2 606080-73-3 C20H24N4O4
Oxonic Acid Impurity 1 Oxonic Acid Impurity 1 60301-55-5 C3H3N3O2
Vortioxetine Impurity 4 Vortioxetine Impurity 4 1293489-77-6 C18H22N2S
Zidovudine USP Impurity G Zidovudine USP Impurity G 148665-49-0 C20H25N7O8
Quinoline, 6,7-dimethoxy-4-(4-nitrophenoxy)- Quinoline, 6,7-dimethoxy-4-(4-nitrophenoxy)- 190728-24-6 C17H14N2O5
Itopride Impurity A Itopride Impurity A 943518-63-6 C16H17NO4
Aripiprazole N1-Oxide Aripiprazole N1-Oxide
Aripiprazole N1-Oxide Aripiprazole N1-Oxide
1-METHYL-5-MERCAPTOTETRAZOLE, SODIUM SALT 1-METHYL-5-MERCAPTOTETRAZOLE, SODIUM SALT 51138-06-8 C2H3N4NaS
Irinotecan Impurity 24 Irinotecan Impurity 24 802277-44-7 C13H24N2O2
Pyridoxine Impurity 12 Pyridoxine Impurity 12 58947-70-9 C8H9NO3
Thiamine Thiamine 6309-04-2 C13H20Br2N4OS
1,1'-(1,4,8,11-tetraazacyclotetradecane-1,4-diyl)bis(2,2,2- trifluoroethan-1-one) dihydrochloride 1,1'-(1,4,8,11-tetraazacyclotetradecane-1,4-diyl)bis(2,2,2- trifluoroethan-1-one) dihydrochloride C14H24Cl2F6N4O2
Empagliflozin Impurity 40 Empagliflozin Impurity 40
Empagliflozin Impurity 46 Empagliflozin Impurity 46
Mupirocin Impurity P/Decyl [2E,8[2S,3S(1S,2S)]]-5,9-Anhydro-2,3,4,8-tetradeoxy-8-[[3-(2-hydroxy-1-methylpropyl)oxiranyl]methyl]-3-methyl-L-talo-Non-2-enonic Acid Ester Mupirocin Impurity P/Decyl [2E,8[2S,3S(1S,2S)]]-5,9-Anhydro-2,3,4,8-tetradeoxy-8-[[3-(2-hydroxy-1-methylpropyl)oxiranyl]methyl]-3-methyl-L-talo-Non-2-enonic Acid Ester 153900-96-0 C27H48O7
Aprepitant Aprepitant 1242175-38-7 C20H18F7NO2
pranoprofen pranoprofen 143436-36-6 C17H19NO4
2-[(1,3-dihydro-1-hydroxy-2,1-benzoxaborol-5-yl)oxy]Benzonitrile 2-[(1,3-dihydro-1-hydroxy-2,1-benzoxaborol-5-yl)oxy]Benzonitrile 906673-30-1 C14H10BNO3
Fluconazole Impurity 5 Fluconazole Impurity 5 154534-83-5 C10H9ClF2N4O
Fexofenadine N-Oxide Fexofenadine N-Oxide 1422515-52-3 C32H39NO5
Trimetazidine Impurity 16 Trimetazidine Impurity 16 118709-62-9 C13H16O4
Ortho-Isomer of Dapagliflozin Ortho-Isomer of Dapagliflozin 2040305-05-1 C21H25ClO6
Acarbose Impurity H Acarbose Impurity H
Acarbose Impurity H Acarbose Impurity H
Chidamide-13C7 Chidamide-13C7 1348337-81-4 C24H18N4O4
Imidafenacin Related Compound 9 Imidafenacin Related Compound 9 170105-17-6 C21H21N3
Atracurium Impurity M Atracurium Impurity M
Cefminox Sodium impurity 1 Cefminox Sodium impurity 1
Dapagliflozin Impurity 5 Dapagliflozin Impurity 5
Emtricitabine Impurity E Emtricitabine Impurity E
Furosemide Impurity 4 Furosemide Impurity 4 C12H11ClN2O5S
Pitavastatin Impurity 43 Pitavastatin Impurity 43
Tazobactam Impurity B Tazobactam Impurity B 158411-82-6 C6H11NO3S
Tirofiban Impurity E Tirofiban Impurity E
Tofacitinib Impurity 73 Tofacitinib Impurity 73
Tofacitinib Impurity 82 Tofacitinib Impurity 82
Apixaban Impurity 37 Apixaban Impurity 37
Atracurium Impurity 27 Atracurium Impurity 27
Aztreonam Impurity 3 Aztreonam Impurity 3
Aztreonam Impurity 9 Aztreonam Impurity 9
Bendamustine Impurity 24 Bendamustine Impurity 24
Bosutinib Impurity 4 Bosutinib Impurity 4 142072-71-7 C10H11NO4
Cefazolin EP Impurity L Cefazolin EP Impurity L
Cefoxitin Impurity 2 Cefoxitin Impurity 2
Clotrimazole Impurity 4 Clotrimazole Impurity 4
Dasatinib impurity 29 Dasatinib impurity 29 1417651-54-7 C21H16Cl3N7OS
Erlotinib Impurity 58 Erlotinib Impurity 58 2246399-22-2 C10H12N2O3
Lamivudine Impurity 4 Lamivudine Impurity 4
Olaparib Impurity 37 Olaparib Impurity 37
Oseltamivir Impurity 3 Oseltamivir Impurity 3
Phenylephrine Impurity 2 Phenylephrine Impurity 2 C9H13NO2
Pitavastatin Impurity 23 Pitavastatin Impurity 23 1467166-39-7 C28H28FNO4
Pregabalin Impurity 24 Pregabalin Impurity 24
Rocuronium Bromide Impurity 11 Rocuronium Bromide Impurity 11
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