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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
D-erythro-3,4-Dihydroxyphenylserine D-erythro-3,4-Dihydroxyphenylserine 51829-98-2 C9H11NO5
aztreonam aztreonam 80951-91-3 C13H17N5O8S2
5H-[1]Benzopyrano[2,3-b]pyridine,7-ethyl-(9CI) 5H-[1]Benzopyrano[2,3-b]pyridine,7-ethyl-(9CI) 639857-68-4 C14H13NO
[1,1-Biphenyl]-2,2,4,4,5,5-hexol(9CI) [1,1-Biphenyl]-2,2,4,4,5,5-hexol(9CI) 76625-61-1 C12H10O6
3-[3-(tert-butylamino)-2-hydroxypropoxy]-4-morpholino-1,2,5-thiadiazole monomaleate 3-[3-(tert-butylamino)-2-hydroxypropoxy]-4-morpholino-1,2,5-thiadiazole monomaleate 57073-55-9 C17H28N4O7S
Ampicillin Impurity U Ampicillin Impurity U
Canagliflozin Hydroperoxide Impurity Canagliflozin Hydroperoxide Impurity
(E)-2-hydroxy-4-(phenyldiazenyl)benzoic acid (E)-2-hydroxy-4-(phenyldiazenyl)benzoic acid 40038-46-8 C13H10N2O3
Sitagliptin EP Impurity 6 Sitagliptin EP Impurity 6
Vonoprazan-005 Vonoprazan-005 2514735-09-0 C33H27F3N4
D-erythro-Hexonic acid, 6-S-2-benzothiazolyl-2,4-dideoxy-6-thio-, 1,1-dimethylethyl ester D-erythro-Hexonic acid, 6-S-2-benzothiazolyl-2,4-dideoxy-6-thio-, 1,1-dimethylethyl ester 1469771-46-7 C17H23NO4S2
(1R,2R,4S,5S,7s,9R)-9-butyl-7-(((S)-3-hydroxy-2-phenylpropanoyl)oxy)-9-methyl-3-oxa-9-azatricyclo[3.3.1.02,4]nonan-9-ium bromide (1R,2R,4S,5S,7s,9R)-9-butyl-7-(((S)-3-hydroxy-2-phenylpropanoyl)oxy)-9-methyl-3-oxa-9-azatricyclo[3.3.1.02,4]nonan-9-ium bromide
1-Demethyl Hydroxy Daunomycinone 1-Demethyl Hydroxy Daunomycinone 58199-98-7 C20H16O9
(S)-2-(butylsulfonamido)-3-(4-(4-(1-methylpiperidin-4-yl)butoxy)phenyl)propanoic acid (S)-2-(butylsulfonamido)-3-(4-(4-(1-methylpiperidin-4-yl)butoxy)phenyl)propanoic acid 1631053-75-2 C23H38N2O5S
Tamsulosin EP Impurity C (Desethoxy Tamsulosin) Tamsulosin EP Impurity C (Desethoxy Tamsulosin)
Itropopa Impurity 17 Itropopa Impurity 17
Cefazolin Epimer Cefazolin Impuirty M (USP), Cefazolin Impurity L (EP) Cefazolin Epimer Cefazolin Impuirty M (USP), Cefazolin Impurity L (EP)
Relugolix Impurity 66 Relugolix Impurity 66 2591260-06-7 C25H24F2N2O6S
methyl 3-(4-(2-hydroxy-3-(isopropylamino)propoxy)phenyl)-3- oxopropanoate methyl 3-(4-(2-hydroxy-3-(isopropylamino)propoxy)phenyl)-3- oxopropanoate
Δ3-7-ACT Δ3-7-ACT
methyl 5-methyl-3'-nitro-3-oxo-1,2,3,6-tetrahydro-[1,1'-biphenyl]-2-carboxylate methyl 5-methyl-3'-nitro-3-oxo-1,2,3,6-tetrahydro-[1,1'-biphenyl]-2-carboxylate 2469735-68-8 C15H15NO5
Pregn-4-ene-3,20-dione, 9-fluoro-11-hydroxy-16,17-[(1-methylethylidene)bis(oxy)]-, (11β,16α)- Pregn-4-ene-3,20-dione, 9-fluoro-11-hydroxy-16,17-[(1-methylethylidene)bis(oxy)]-, (11β,16α)- 3093-36-5 C24H33FO5
INDEX NAME NOT YET ASSIGNED INDEX NAME NOT YET ASSIGNED 2402776-84-3 C23H27N9O4S2
Cyclopentanecarboxylic acid, 3-[(1S)-1-(acetylamino)-2-ethylbutyl]-4-[(aminocarbonyl)amino]-2-hydroxy-, (1S,2S,3R,4R)- Cyclopentanecarboxylic acid, 3-[(1S)-1-(acetylamino)-2-ethylbutyl]-4-[(aminocarbonyl)amino]-2-hydroxy-, (1S,2S,3R,4R)- 2597901-48-7 C15H27N3O5
3-Isoquinolinecarboxylic acid, 7-(4-chlorophenoxy)-4-hydroxy-, methyl ester 3-Isoquinolinecarboxylic acid, 7-(4-chlorophenoxy)-4-hydroxy-, methyl ester 2711953-58-9 C17H12ClNO4
(2-(2-((tert-butoxycarbonyl)(methyl)amino)-N-methylacetamido)pyridin-3-yl)methyl N-(tert-butoxycarbonyl)-N-methylglycinate (2-(2-((tert-butoxycarbonyl)(methyl)amino)-N-methylacetamido)pyridin-3-yl)methyl N-(tert-butoxycarbonyl)-N-methylglycinate
Benzoic acid, 3-(aminosulfonyl)-2,4-dichloro- Benzoic acid, 3-(aminosulfonyl)-2,4-dichloro- 1870323-25-3 C7H5Cl2NO4S
Benzeneacetamide, N,α,α-trimethyl-N-[6-(4-methyl-1,4-dioxido-1-piperazinyl)-4-(2-methylphenyl)-3-pyridinyl]-3,5-bis(trifluoromethyl)- Benzeneacetamide, N,α,α-trimethyl-N-[6-(4-methyl-1,4-dioxido-1-piperazinyl)-4-(2-methylphenyl)-3-pyridinyl]-3,5-bis(trifluoromethyl)- 1431216-61-3 C30H32F6N4O3
1,3-Dioxane-4-acetic acid, 6-[2-[2-(4-fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrol-1-yl]ethyl]-2,2-dimethyl-, sodium salt (1:1), (4R,6R)- 1,3-Dioxane-4-acetic acid, 6-[2-[2-(4-fluorophenyl)-5-(1-methylethyl)-3-phenyl-4-[(phenylamino)carbonyl]-1H-pyrrol-1-yl]ethyl]-2,2-dimethyl-, sodium salt (1:1), (4R,6R)- 862260-38-6 C36H40FN2NaO5
Avatrombopag Impurity 54 Avatrombopag Impurity 54
NA NA
Tafluprost Impurity 15 Tafluprost Impurity 15
NA NA
Rosuvastatin Impurity 140 Rosuvastatin Impurity 140
Rosuvastatin Impurity 130 Rosuvastatin Impurity 130
Terlipressin Impurity 1 (des-Gly1) Terlipressin Impurity 1 (des-Gly1)
Brivaracetam Impurity 66 Brivaracetam Impurity 66
2-Acetoxymethyl1-3-Methyl-4- 2-Acetoxymethyl1-3-Methyl-4- 112525-75-4 C11H12F3NO3
N-(7-chloro-4-((3-chloro-4-fluorophenyl)amino)quinazolin-6-yl)-4-(dimethylamino)butanamide N-(7-chloro-4-((3-chloro-4-fluorophenyl)amino)quinazolin-6-yl)-4-(dimethylamino)butanamide
Ertapenem Impurity D(USP) Ertapenem Impurity D(USP)
3-(N-Benzyl-N-methylamino)propiophenone hydrochloride 3-(N-Benzyl-N-methylamino)propiophenone hydrochloride 5409-62-1 C17H20ClNO
2(1H)-Isoquinolinecarboxylic acid, 3,4-dihydro-4-hydroxy-1-phenyl-, (3R)-1-azabicyclo[2.2.2]oct-3-yl ester, (1S,4S)- 2(1H)-Isoquinolinecarboxylic acid, 3,4-dihydro-4-hydroxy-1-phenyl-, (3R)-1-azabicyclo[2.2.2]oct-3-yl ester, (1S,4S)- 869884-24-2 C23H26N2O3
Azilsartan Medoxomil Potassium impurity209 Azilsartan Medoxomil Potassium impurity209
Nelarabine impurity 01 Nelarabine impurity 01
Pyridine, 2-(diethylboryl)- (9CI) Pyridine, 2-(diethylboryl)- (9CI) 385804-67-1 C9H14BN
Cyclopropanamine, 2-(3-fluorophenyl)-, (1R,2S)- (9CI) Cyclopropanamine, 2-(3-fluorophenyl)-, (1R,2S)- (9CI) 220353-83-3 C9H10FN
1(2H)-Naphthalenone, 4-hydroxy-3-methyl-2-[(2E,6E,10E)-3,7,11,15-tetramethyl-2,6,10,14-hexadecatetraen-1-ylidene]- 1(2H)-Naphthalenone, 4-hydroxy-3-methyl-2-[(2E,6E,10E)-3,7,11,15-tetramethyl-2,6,10,14-hexadecatetraen-1-ylidene]- 693781-59-8 C31H40O2
Bisoprolol Impurity 50 Bisoprolol Impurity 50
Milnacipran Impurity 26 Milnacipran Impurity 26
Olodaterol Impurity 15 Olodaterol Impurity 15
Dobutamine Impurity 15 Dobutamine Impurity 15
2,3'-Bipyridine, 5-chloro-6'-methyl-3-[4-(methylthio)phenyl]-, hydrochloride (1:1) 2,3'-Bipyridine, 5-chloro-6'-methyl-3-[4-(methylthio)phenyl]-, hydrochloride (1:1) 1447814-82-5 C18H16Cl2N2S
Pitavastatin Impurity 104 Pitavastatin Impurity 104
Tegoprazan Impurity 8 Tegoprazan Impurity 8
2-(((3aS,4R,6S,6aR)-6-((5-amino-6-chloro-2-(propylthio)pyrimidin-4-yl)amino)-2,2-dimethyltetrahydro-4H-cyclopenta[d][1,3]dioxol-4-yl)oxy)ethan-1-ol 2-(((3aS,4R,6S,6aR)-6-((5-amino-6-chloro-2-(propylthio)pyrimidin-4-yl)amino)-2,2-dimethyltetrahydro-4H-cyclopenta[d][1,3]dioxol-4-yl)oxy)ethan-1-ol C17H27ClN4O4S
Clindamycin impurity Clindamycin impurity 198080-64-7 C18H32N2O5S
Digoxin impurity Digoxin impurity
Lamivudine impurity Lamivudine impurity
Levothyroxine Sodium impurity Levothyroxine Sodium impurity 27566-09-2 C14H21NO4
Dexchlorpheniramine impurity Dexchlorpheniramine impurity 73775-50-5 C12H15ClN2
(S)-N-(2-(1-(3-ethoxy-4-hydroxyphenyl)-2-(methylsulfonyl)ethyl)-1,3-dioxoisoindolin-4-yl)acetamide (S)-N-(2-(1-(3-ethoxy-4-hydroxyphenyl)-2-(methylsulfonyl)ethyl)-1,3-dioxoisoindolin-4-yl)acetamide 1384441-38-6 C21H22N2O7S
(1R,2S,3S)-Aprepitant (1R,2S,3S)-Aprepitant 172822-28-5 C23H21F7N4O3
(((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)sulfinyl)-1H-benzo[d]imidazole compound with 6-methoxy-1-((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)-2-(((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)sulfinyl)-1H-benzo[d]imidazole (1:1) (((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)sulfinyl)-1H-benzo[d]imidazole compound with 6-methoxy-1-((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)-2-(((4-methoxy-3,5-dimethylpyridin-2-yl)methyl)sulfinyl)-1H-benzo[d]imidazole (1:1)
6-benzyloxy-8-((R)-2-chloro-1-hydroxy-ethyl)-4H-benzo[1,4]-oxazin-3-one 6-benzyloxy-8-((R)-2-chloro-1-hydroxy-ethyl)-4H-benzo[1,4]-oxazin-3-one 869478-11-5 C17H16ClNO4
ethyl (41R,13aS)-13a-ethyl-2,3,41,5,6,13a-hexahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridine-12-carboxylate ethyl (41R,13aS)-13a-ethyl-2,3,41,5,6,13a-hexahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridine-12-carboxylate 77549-94-1 C22H26N2O2
Dolutegravir Impurity 2 Dolutegravir Impurity 2
Lesinurad Impurity J Lesinurad Impurity J 1210330-64-5 C14H10BrN3O2S
INDEX NAME NOT YET ASSIGNED INDEX NAME NOT YET ASSIGNED 2706536-33-4 C27H34N2O2
Nirmatrelvir Impurity 10 Nirmatrelvir Impurity 10
NA NA
7-(ALPHA-BROMOACETAMIDO)CEPHALOSPORANIC ACID 7-(ALPHA-BROMOACETAMIDO)CEPHALOSPORANIC ACID 26973-80-8 C12H13BrN2O6S
Bumetanide Impurity 20 Bumetanide Impurity 20
Rocuronium Bromide Impurity 28 、29 Rocuronium Bromide Impurity 28 、29
Roxadustat Impurity 22 Roxadustat Impurity 22
Olaparib Impurity 41 Olaparib Impurity 41
Perospirone Impurity 22 Perospirone Impurity 22
Perospirone Impurity 14 Perospirone Impurity 14 87691-94-9 C15H20BrN3S
Dolutegravir Impurity 22 Dolutegravir Impurity 22
Paxlovid Impurity 20 Paxlovid Impurity 20
NA NA
Revefenacin Impurity 16 Revefenacin Impurity 16
Fondaparinux sodium impurity 8 Fondaparinux sodium impurity 8
Fondaparinux sodium impurity 14 Fondaparinux sodium impurity 14
Fondaparinux Sodium Impurity 9 Fondaparinux Sodium Impurity 9
Oxacillin sodium Impurity D Oxacillin sodium Impurity D
Piracetam IMPURITY Piracetam IMPURITY
Nilotinib N-Oxide Impurity 4 Nilotinib N-Oxide Impurity 4
sodium (6R,7S)-7-amino-7-methoxy-6-methyl-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate sodium (6R,7S)-7-amino-7-methoxy-6-methyl-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylate
Olodaterol Impurity 32 Olodaterol Impurity 32
(R)-Lercanidipine Hydrochloride (R)-Lercanidipine Hydrochloride 187731-34-6 C36H42ClN3O6
2-Oxo Clopidogrel Hydrochloride (Mixture of diastereomers) 2-Oxo Clopidogrel Hydrochloride (Mixture of diastereomers) 109904-27-0 C16H16ClNO3S
5-Hydroxy-6-methoxy-1-indanone 5-Hydroxy-6-methoxy-1-indanone 127399-78-4 C10H10O3
Desfluoro Citalopram Oxalate Desfluoro Citalopram Oxalate 1093072-86-6 C22H24N2O5
Didesmethyl Zolmitriptan Didesmethyl Zolmitriptan 139264-15-6 C14H17N3O2
Gabapentin Related Compound E Gabapentin Related Compound E 67950-95-2 C9H14O4
Hydroxy Bosentan Hydroxy Bosentan 253688-60-7 C27H29N5O7S
Lisinopril S,S,S-Diketopiperazine Lisinopril S,S,S-Diketopiperazine 328385-86-0 C21H29N3O4
rac 4-Desmethoxy-4-nitro Omeprazole rac 4-Desmethoxy-4-nitro Omeprazole 317807-10-6 C16H16N4O4S
trans 1-Benzyl-4-(4-fluorophenyl)-3-piperidinemethanol trans 1-Benzyl-4-(4-fluorophenyl)-3-piperidinemethanol 201855-60-9 C19H22FNO
ETHYL 7-CHLORO-1-ETHYL-6-FLUORO-1,4-DIHYDRO-4-OXO-QUINOLINE-5-CARBOXYLATE ETHYL 7-CHLORO-1-ETHYL-6-FLUORO-1,4-DIHYDRO-4-OXO-QUINOLINE-5-CARBOXYLATE 70458-94-5 C14H13ClFNO3
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