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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
Celebrex Carboxylic Acid Methyl Ester Celebrex Carboxylic Acid Methyl Ester 1189893-75-1 C18H14F3N3O4S
(S)-BoroLeu-(-)-Pinanediol-hydrochloride (S)-BoroLeu-(-)-Pinanediol-hydrochloride 945606-99-5 C15H29BClNO2
Chloromethyl ethyl carbonate Chloromethyl ethyl carbonate 35179-98-7 C4H7ClO3
Bimatoprost Impurity 10 Bimatoprost Impurity 10
Carbetocin S-Oxide II Carbetocin S-Oxide II
Empagliflozin Impurity 82 Empagliflozin Impurity 82 2452301-16-3 C17H16ClIO2
Empagliflozin Impurity 88 Empagliflozin Impurity 88
Tofacitinib Impurity K Tofacitinib Impurity K 2328165-36-0 C16H21N5O3
Olopatadine Impurity 13 Olopatadine Impurity 13 55453-90-2 C18H16O4
Avibactam sodium Impurity CIA Avibactam sodium Impurity CIA
4-((2-amino-2-oxoethyl)amino)butanoic acid 4-((2-amino-2-oxoethyl)amino)butanoic acid 1096803-44-9 C6H12N2O3
Lenvatinib impurity LFZZ-17 Lenvatinib impurity LFZZ-17 C11H9NO4
Ornidazole Impurity 25 Ornidazole Impurity 25
Pitavastatin Impurity 72 Pitavastatin Impurity 72
Febuxostat Impurity 109 Febuxostat Impurity 109
Brivaracetam Impurity 37 Brivaracetam Impurity 37
Ticagrelor Impurity 133 Ticagrelor Impurity 133
4-[(1,3-Dihydro-1-hydroxy-2,1-benzoxaborol-5-yl)oxy]-benzamide 4-[(1,3-Dihydro-1-hydroxy-2,1-benzoxaborol-5-yl)oxy]-benzamide 1187188-59-5 C14H12BNO4
(N-tert-Butoxycarbonyl-N-[(1'R)-hydroxy-1-phenyl)ethyl])-4-nitrophenylethylaMine (N-tert-Butoxycarbonyl-N-[(1'R)-hydroxy-1-phenyl)ethyl])-4-nitrophenylethylaMine 223673-35-6 C21H26N2O5
N-DesMethyl SuMatriptan N-DesMethyl SuMatriptan 88919-51-1 C13H19N3O2S
2-epi-(-)-EMtricitabine 2-epi-(-)-EMtricitabine 145416-34-8 C8H10FN3O3S
Parent nucleus of cefotiaM hydrochloride Parent nucleus of cefotiaM hydrochloride 372092-19-8 C13H21N7O3S2
Bisacodyl Related Compound E (20 mg) (2-[(4-Acetoxyphenyl)(pyridin-2-yl)methyl]phenyl acetate) Bisacodyl Related Compound E (20 mg) (2-[(4-Acetoxyphenyl)(pyridin-2-yl)methyl]phenyl acetate) 111664-35-8 C22H19NO4
N-METHYL-3-CHLORO-3-PHENYL PROPYLAMINE HCL N-METHYL-3-CHLORO-3-PHENYL PROPYLAMINE HCL 128036-32-8 C10H15Cl2N
2,4,5-TRIFLUORO-3-METHOXYBENZOIC ACID 2,4,5-TRIFLUORO-3-METHOXYBENZOIC ACID 11281-65-5 C8H5F3O3
METHYL TRIPHENYLMETHYL ETHER METHYL TRIPHENYLMETHYL ETHER 596-31-6 C20H18O
2-Propenoic acid, 3-[4-(hydroxymethyl)phenyl]- 2-Propenoic acid, 3-[4-(hydroxymethyl)phenyl]- 219915-41-0 C10H10O3
L-Alanine, 3-[(R)-(carboxymethyl)sulfinyl]- L-Alanine, 3-[(R)-(carboxymethyl)sulfinyl]- 61475-35-2 C5H9NO5S
Phenol, 2-(2-phenyldiazenyl)- Phenol, 2-(2-phenyldiazenyl)- 2362-57-4 C12H10N2O
3-Quinolinecarboxylic acid, 1-cyclopropyl-7-fluoro-1,4-dihydro-6,8-dimethoxy-4-oxo- 3-Quinolinecarboxylic acid, 1-cyclopropyl-7-fluoro-1,4-dihydro-6,8-dimethoxy-4-oxo- 2410658-30-7 C15H14FNO5
Hexanoic acid, 3-(hydroxymethyl)- Hexanoic acid, 3-(hydroxymethyl)- 81381-87-5 C7H14O3
1-Pyrrolidinecarboxylic acid, 3,3'-dithiobis[5-[(dimethylamino)carbonyl]-, 1,1'-bis[(4-nitrophenyl)methyl] ester, (3S,3'S,5S,5'S)- 1-Pyrrolidinecarboxylic acid, 3,3'-dithiobis[5-[(dimethylamino)carbonyl]-, 1,1'-bis[(4-nitrophenyl)methyl] ester, (3S,3'S,5S,5'S)- 936226-36-7 C30H36N6O10S2
D-Glucitol, 1,5-anhydro-1-C-[4-chloro-3-[[4-(1-methylethoxy)phenyl]methyl]phenyl]-, (1S)- D-Glucitol, 1,5-anhydro-1-C-[4-chloro-3-[[4-(1-methylethoxy)phenyl]methyl]phenyl]-, (1S)- 946525-39-9 C22H27ClO6
Topiroxostat Impurity 42 Topiroxostat Impurity 42
Crisaborole intermediate Crisaborole intermediate 1187188-60-8 C14H13BO4
Regorafenib Impurity MHY Regorafenib Impurity MHY
2-Thiazolamine, 5-(4-cyclohexyl-1-piperazinyl)-4-(4,5-dichloro-2-thienyl)- 2-Thiazolamine, 5-(4-cyclohexyl-1-piperazinyl)-4-(4,5-dichloro-2-thienyl)- 570407-63-5 C17H22Cl2N4S2
N,N'-(2,2'-(sulfonylbis(1-(3-ethoxy-4-methoxyphenyl)ethane-2,1-diyl))bis(1,3-dioxoisoindoline-4,2-diyl))diacetamide N,N'-(2,2'-(sulfonylbis(1-(3-ethoxy-4-methoxyphenyl)ethane-2,1-diyl))bis(1,3-dioxoisoindoline-4,2-diyl))diacetamide 2417213-74-0 C42H42N4O12S
Lumateperone Impurity 6 Lumateperone Impurity 6 313368-82-0 C23H26FN3O
1H-?Indole-?5,?6-?diol, 1-?[3-?(4-?hydroxyphenyl)?-?1-?methylpropyl]?- 1H-?Indole-?5,?6-?diol, 1-?[3-?(4-?hydroxyphenyl)?-?1-?methylpropyl]?- 2514709-72-7 C18H19NO3
2,8-Chrysenedione, 10b-fluoro-1,3,4,4a,4b,5,6,10a,10b,11,12,12a-dodecahydro-1,11-dihydroxy-3,10a,12a-trimethyl-1-[(phosphonooxy)methyl]-, (1S,3S,4aS,4bS,10aS,10bR,11S,12aS)- 2,8-Chrysenedione, 10b-fluoro-1,3,4,4a,4b,5,6,10a,10b,11,12,12a-dodecahydro-1,11-dihydroxy-3,10a,12a-trimethyl-1-[(phosphonooxy)methyl]-, (1S,3S,4aS,4bS,10aS,10bR,11S,12aS)- 1202002-01-4 C22H30FO8P
6,6'-oxybis(3-((4-oxo-3,4-dihydrophthalazin-1-yl)methyl)benzoic acid) 6,6'-oxybis(3-((4-oxo-3,4-dihydrophthalazin-1-yl)methyl)benzoic acid)
4-Pyrimidineethanol, 6-bromo-α-(2,4-difluorophenyl)-5-fluoro-β-methyl-α-(1H-1,2,4-triazol-1-ylmethyl)- 4-Pyrimidineethanol, 6-bromo-α-(2,4-difluorophenyl)-5-fluoro-β-methyl-α-(1H-1,2,4-triazol-1-ylmethyl)- 1307315-04-3 C16H13BrF3N5O
Cycloocta[b]pyridine, 2-(4-ethyl-1,4-dioxido-1-piperazinyl)-4-(4-fluorophenyl)-5,6,7,8,9,10-hexahydro- Cycloocta[b]pyridine, 2-(4-ethyl-1,4-dioxido-1-piperazinyl)-4-(4-fluorophenyl)-5,6,7,8,9,10-hexahydro- 2247538-61-8 C23H30FN3O2
Vonoprazan Impurity B-3 Vonoprazan Impurity B-3
3-Azetidineacetamide, 1-(ethylsulfonyl)-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]- 3-Azetidineacetamide, 1-(ethylsulfonyl)-3-[4-(7H-pyrrolo[2,3-d]pyrimidin-4-yl)-1H-pyrazol-1-yl]- 2271228-51-2 C16H19N7O3S
Budesonide Impurity 26 Budesonide Impurity 26
Peramivir Impurity 48 Peramivir Impurity 48
Tolvaptan dehydroxylated impurity Tolvaptan dehydroxylated impurity
3-Quinolinemethanol, 2-cyclopropyl-4-phenyl- 3-Quinolinemethanol, 2-cyclopropyl-4-phenyl- 2153433-73-7 C19H17NO
Avatrombopag Impurity 37 Avatrombopag Impurity 37
Piperacillin ImpurityABCDEFGHI Piperacillin ImpurityABCDEFGHI
5,6-DIMETHOXY-2-PYRIDIN-4-YLMETHYL-INDAN-1-ONE 5,6-DIMETHOXY-2-PYRIDIN-4-YLMETHYL-INDAN-1-ONE 4803-57-0 C17H17NO3
3-(Dimethylamino)-1-(2-thienyl)-1-propanol 3-(Dimethylamino)-1-(2-thienyl)-1-propanol 13636-02-7 C9H15NOS
Azelastine N-Oxide Azelastine N-Oxide 640279-88-5 C22H24ClN3O2
Desloratadine Hydroxypiperidine N-Oxide Desloratadine Hydroxypiperidine N-Oxide 1193725-75-5 C19H15ClN2O2
16α,17,21-Trihydroxy-pregna-1,4-diene-3,11,20-trione 16α,17,21-Trihydroxy-pregna-1,4-diene-3,11,20-trione 3754-05-0 C21H26O6
4H-Furo[2,3-c]pyranyl Mupirocin SodiuM IMpurity 4H-Furo[2,3-c]pyranyl Mupirocin SodiuM IMpurity 116182-43-5 C26H43NaO9
4-Methyl Erlotinib Hydrochloride 4-Methyl Erlotinib Hydrochloride 1346601-52-2 C23H25N3O4
5-[[(4-Fluorophenyl)Methyl]aMino]-1,3-dihydro-2H-iMidazo[4,5-b]pyridin-2-one 5-[[(4-Fluorophenyl)Methyl]aMino]-1,3-dihydro-2H-iMidazo[4,5-b]pyridin-2-one 951624-49-0 C13H11FN4O
Perindoprilat LactaM B Perindoprilat LactaM B 130061-28-8 C17H26N2O4
PseudoMonic Acid D SodiuM PseudoMonic Acid D SodiuM 85178-60-5 C26H41NaO9
2-Desisopropyl-2-phenyl Repaglinide 2-Desisopropyl-2-phenyl Repaglinide 107362-12-9 C30H34N2O4
2-(3-CHLOROPHENYL)-2-CYANO-1-(3-PYRIDINYL)-1-ETHANONE 2-(3-CHLOROPHENYL)-2-CYANO-1-(3-PYRIDINYL)-1-ETHANONE 114444-10-9 C14H9ClN2O
BENZENE ACETIC ACID, 4-[(2-CARBOXYPHENYL)METHOXY] BENZENE ACETIC ACID, 4-[(2-CARBOXYPHENYL)METHOXY] 55453-89-9 C16H14O5
Ipragliflozin Impurity 5 Ipragliflozin Impurity 5
Alectinib Impurity Alectinib Impurity 1256584-83-4 C26H25N3O2
Afatinib impurity 11/Des-(4-dimethylamino-2-en-1-oxo)butylamino 6-(5-Hydroxy-pyrrolidin-2-on-1-yl) Afatinib Afatinib impurity 11/Des-(4-dimethylamino-2-en-1-oxo)butylamino 6-(5-Hydroxy-pyrrolidin-2-on-1-yl) Afatinib 2223677-58-3 C22H20ClFN4O4
Ibrutinib Impurity 18 Ibrutinib Impurity 18 1881246-01-0 C16H12N4O
Vitamin B1 Impurity 6 Vitamin B1 Impurity 6 C12H17ClN4OS
5,5'-((tert-butylazanediyl)bis(1-hydroxyethane-2,1-diyl))bis(benzene- 1,3-diol) 5,5'-((tert-butylazanediyl)bis(1-hydroxyethane-2,1-diyl))bis(benzene- 1,3-diol) C20H27NO6
2,2'-difluoro-3,3'-dimethoxy-1,1'-biphenyl 2,2'-difluoro-3,3'-dimethoxy-1,1'-biphenyl 2316733-82-9 C14H12F2O2
951313-25-0 951313-25-0 951313-25-0 C25H33N3O6
METOPROLOL IMPURITY D METOPROLOL IMPURITY D C15H25NO3
NITRENDIPINE IMPURITY A NITRENDIPINE IMPURITY A
TAMSULOSIN IMPURITY D TAMSULOSIN IMPURITY D C20H28N2O5S
Macitentan Hydroxy amine Impurity Macitentan Hydroxy amine Impurity 2211059-05-9 C12H12BrN3O2
1,3-diethyl-1,3-dimethylurea 1,3-diethyl-1,3-dimethylurea 31468-19-6 C7H16N2O
2,4(1H,3H)-Pyrimidinedione, 6-[(3R)-3-amino-1-piperidinyl]-3-methyl- 2,4(1H,3H)-Pyrimidinedione, 6-[(3R)-3-amino-1-piperidinyl]-3-methyl- 2276323-24-9 C10H16N4O2
7H-Purine-7-acetic acid, 1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxo-, ethyl ester 7H-Purine-7-acetic acid, 1,2,3,6-tetrahydro-1,3-dimethyl-2,6-dioxo-, ethyl ester 7029-96-1 C11H14N4O4
N-(2-Amino-4,5,6,7-tetrahydro-benzothiazol-6-yl)-acrylamide N-(2-Amino-4,5,6,7-tetrahydro-benzothiazol-6-yl)-acrylamide
Rifampin Impurity 6 Rifampin Impurity 6
Cefuroxime Dioxide Impurity(Cefuroxime Sulfoxide) Cefuroxime Dioxide Impurity(Cefuroxime Sulfoxide)
Ampicillin Impurity F(USP) Ampicillin Impurity F(USP)
Azlocillin Opern-Ring Acetylation Impurity Azlocillin Opern-Ring Acetylation Impurity
Miconazole Impurity G(EP) Miconazole Impurity G(EP) 1370335-40-2 C18H14Cl4N2O
2-chloro-1-(5-hydroxy-5H-chromeno[2,3-b]pyridin-7-yl)propan-1-one 2-chloro-1-(5-hydroxy-5H-chromeno[2,3-b]pyridin-7-yl)propan-1-one
2-(5H-chromeno[2,3-b]pyridin-7-yl)acrylic acid 2-(5H-chromeno[2,3-b]pyridin-7-yl)acrylic acid 52549-22-1 C15H11NO3
1-(6-chloro-5-fluoropyrimidin-4-yl)ethanol 1-(6-chloro-5-fluoropyrimidin-4-yl)ethanol 1289559-76-7 C6H6ClFN2O
Fluoxetine Impurity 29,methyl({3-phenyl-3-[2-(trifluoromethyl)phenoxy]propyl})amine Fluoxetine Impurity 29,methyl({3-phenyl-3-[2-(trifluoromethyl)phenoxy]propyl})amine 56161-71-8 C17H18F3NO
(Z)-4-chloro-6-(3-(2,4-difluorophenyl)-4-(1H-1,2,4-triazol-1-yl)but-3-en-2-yl)-5-fluoropyrimidine (Z)-4-chloro-6-(3-(2,4-difluorophenyl)-4-(1H-1,2,4-triazol-1-yl)but-3-en-2-yl)-5-fluoropyrimidine
Ceftriaxone sodium impurity 09 Ceftriaxone sodium impurity 09
Cefradine Impurity 8 Cefradine Impurity 8 30959-67-2 C16H19N3O4S
Dobutamine Impurity 3 Dobutamine Impurity 3 334947-75-0 C19H25NO3
Anastrozole Impurity 19 Anastrozole Impurity 19 1301724-97-9 C19H21N3O2
Biotin Impurity Biotin Impurity 171232-73-8 C19H18N2O2S
PANTOPRAZOLE N-OXIDE PANTOPRAZOLE N-OXIDE 953787-60-5 C16H15F2N3O5S
DEHYDROARIPIPRAZOLE, HYDROCHLORIDE DEHYDROARIPIPRAZOLE, HYDROCHLORIDE 1008531-60-9 C23H26Cl3N3O2
N-(3-GUANIDINO-4-METHYLPHENYL)-4-(METHYLPIPERAZINE-1-YL-METHYL)BENZAMIDE N-(3-GUANIDINO-4-METHYLPHENYL)-4-(METHYLPIPERAZINE-1-YL-METHYL)BENZAMIDE 581076-65-5 C21H28N6O
Tirofiban-d9 Hydrochloride Tirofiban-d9 Hydrochloride 1331911-68-2 C22H37ClN2O5S
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