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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
3-chloro-5-((1-((4-methyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)methyl)-2-oxo-4-(trifluoromethyl)-1,2-dihydropyridin-3-yl)oxy)benzoic acid 3-chloro-5-((1-((4-methyl-5-oxo-4,5-dihydro-1H-1,2,4-triazol-3-yl)methyl)-2-oxo-4-(trifluoromethyl)-1,2-dihydropyridin-3-yl)oxy)benzoic acid 3056231-13-8 C17H12ClF3N4O5
6-(1-methyl-1H-indazol-5-yl)pyrimidin-4-ol 6-(1-methyl-1H-indazol-5-yl)pyrimidin-4-ol
Atorvastatin Lactam Impurity Atorvastatin Lactam Impurity 906552-18-9 C33H35FN2O6
1,3-Bis(9H-carbazol-4-yloxy)-2-propanol (Carvedilol Impurity) 1,3-Bis(9H-carbazol-4-yloxy)-2-propanol (Carvedilol Impurity) 1276477-91-8 C27H22N2O3
Atorvastatin Lactone Diepoxide Atorvastatin Lactone Diepoxide 1046118-40-4 C33H33FN2O6
2-Carboxybenzoyl Amlodipine 2-Carboxybenzoyl Amlodipine 318465-73-5 C28H29ClN2O8
rac-trans-4-Desfluoro-4-methoxy Paroxetine Hydrochloride rac-trans-4-Desfluoro-4-methoxy Paroxetine Hydrochloride 127017-74-7 C20H24ClNO4
Des(isopropoxyethyl) Bisoprolol Des(isopropoxyethyl) Bisoprolol 62572-93-4 C13H21NO3
Desmethoxy Fluvoxamine Desmethoxy Fluvoxamine 1217216-82-4 C14H19F3N2O
4'-Deoxy Vincristine 4'-Deoxy Vincristine 68135-16-0 C46H56N4O9
Demethyl Chlorpromazine Hydrochloride Demethyl Chlorpromazine Hydrochloride 3953-65-9 C16H18Cl2N2S
6-Hydroxy-6-defluoro Ciprofloxacin 6-Hydroxy-6-defluoro Ciprofloxacin 226903-07-7 C17H19N3O4
N-(2-Succinyl) Fluvoxamine N-(2-Succinyl) Fluvoxamine 259526-43-7 C19H25F3N2O6
Methylene-Bis Paroxetine Dihydrochloride Methylene-Bis Paroxetine Dihydrochloride 606968-05-2 C39H40F2N2O6
Nicorandil N-Oxide Nicorandil N-Oxide 107833-98-7 C8H9N3O5
2-Phenyl-1-[4-(trifluoromethyl)phenyl]ethane 2-(Aminoethyl)oxime (Fluvoxamine Impurity) 2-Phenyl-1-[4-(trifluoromethyl)phenyl]ethane 2-(Aminoethyl)oxime (Fluvoxamine Impurity) 1217241-15-0 C17H17F3N2O
cis-Montelukast cis-Montelukast 774538-96-4 C35H36ClNO3S
(S)-(-)-Tolvaptan (S)-(-)-Tolvaptan 331947-44-5 C26H25ClN2O3
10-[3-(Dimethylamino)propyl]-10H-phenothiazine 5-oxide 10-[3-(Dimethylamino)propyl]-10H-phenothiazine 5-oxide 146-21-4 C17H20N2OS
3,3'-((2,2'-bis(ethoxymethyl)-[1,1'-biphenyl]-4,4'-diyl)bis(methylene))bis(2-butyl-1,3-diazaspiro[4.4]non-1-en-4-one) 3,3'-((2,2'-bis(ethoxymethyl)-[1,1'-biphenyl]-4,4'-diyl)bis(methylene))bis(2-butyl-1,3-diazaspiro[4.4]non-1-en-4-one)
(2R,3R)-2-(4-(cyclopentylamino)phenyl)-1-(2-fluoro-6-methylbenzoyl)-N-(4-methyl-3-(trifluoromethyl)phenyl)piperidine-3-carboxamide (2R,3R)-2-(4-(cyclopentylamino)phenyl)-1-(2-fluoro-6-methylbenzoyl)-N-(4-methyl-3-(trifluoromethyl)phenyl)piperidine-3-carboxamide
(6E,10E)-7,11,15-Trimethyl-3-methylene-1,6,10,14-hexadecatetrene (6E,10E)-7,11,15-Trimethyl-3-methylene-1,6,10,14-hexadecatetrene 70901-63-2 C20H32
4-O-[4-[[(1S)-4β,5α,6β-Trihydroxy-3-(hydroxymethyl)-2-cyclohexen-1β-yl]amino]-4,6-dideoxy-α-D-glucopyranosyl]-D-glucose 4-O-[4-[[(1S)-4β,5α,6β-Trihydroxy-3-(hydroxymethyl)-2-cyclohexen-1β-yl]amino]-4,6-dideoxy-α-D-glucopyranosyl]-D-glucose 68128-53-0 C19H33NO13
4-O-[4-[[(1S)-4β,5α,6β-Trihydroxy-3-(hydroxymethyl)-2-cyclohexen-1β-yl]amino]-4,6-dideoxy-α-D-glucopyranosyl]-D-glucose 4-O-[4-[[(1S)-4β,5α,6β-Trihydroxy-3-(hydroxymethyl)-2-cyclohexen-1β-yl]amino]-4,6-dideoxy-α-D-glucopyranosyl]-D-glucose 68128-53-0 C19H33NO13
CLARITHROMYCIN OXIME CLARITHROMYCIN OXIME 127253-06-9 C38H70N2O13
PYRIDINE,3,5-BIS(BROMOMETHYL)- PYRIDINE,3,5-BIS(BROMOMETHYL)- 35991-75-4 C7H7Br2N
alpha-Hydroxy-alpha-phenylbenzeneacetic acid (3-endo)-8-azabicyclo[3.2.1]oct-3-yl ester hydrochloride alpha-Hydroxy-alpha-phenylbenzeneacetic acid (3-endo)-8-azabicyclo[3.2.1]oct-3-yl ester hydrochloride 63516-30-3 C21H24ClNO3
N-(4-(METHYLAMINO)BENZOYL)-L-GLUTAMIC ACID N-(4-(METHYLAMINO)BENZOYL)-L-GLUTAMIC ACID 52980-68-4 C13H16N2O5
(2R)-N-(2,6-DIMETHYLPHENYL)-2-PIPERIDINECARBOXAMIDE (2R)-N-(2,6-DIMETHYLPHENYL)-2-PIPERIDINECARBOXAMIDE 27262-43-7 C14H20N2O
N-tert-Butoxycarbonyl Mirabegron N-tert-Butoxycarbonyl Mirabegron 1329485-55-3 C26H32N4O4S
Phosphine oxide, tris (2-methylphenyl)- Phosphine oxide, tris (2-methylphenyl)- 6163-63-9 C21H21OP
2-(7-Methoxynaphthalen-1-yl)acetamide 2-(7-Methoxynaphthalen-1-yl)acetamide 138113-07-2 C13H13NO2
2-(7-Methoxynaphthalen-1-yl)acetamide 2-(7-Methoxynaphthalen-1-yl)acetamide 138113-07-2 C13H13NO2
2-(2-carboxyethyl)-1-[(3,4-dimethoxyphenyl)methyl]-,1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-isoquinolinium benzenesulfonate 2-(2-carboxyethyl)-1-[(3,4-dimethoxyphenyl)methyl]-,1,2,3,4-tetrahydro-6,7-dimethoxy-2-methyl-isoquinolinium benzenesulfonate 1075727-06-8 C30H37NO9S
1,2,4-Triazolo[4,3-a]pyrazine, 7-[3-amino-1-oxo-4-(2,4,5-trifluorophenyl)-2-butenyl]-5,6,7,8-tetrahydro- 3-(trifluoromethyl)- 1,2,4-Triazolo[4,3-a]pyrazine, 7-[3-amino-1-oxo-4-(2,4,5-trifluorophenyl)-2-butenyl]-5,6,7,8-tetrahydro- 3-(trifluoromethyl)- 847445-81-2 C16H13F6N5O
4-Difluoromethoxy-2-nitro-aniline 4-Difluoromethoxy-2-nitro-aniline 97963-76-3 C7H6F2N2O3
1,3-bis(2-chloroethyl)benzimidazolin-2-one 1,3-bis(2-chloroethyl)benzimidazolin-2-one 55470-74-1 C11H12Cl2N2O
Nintedanib Impurity A (Intedanib Impurity A ） Nintedanib Impurity A (Intedanib Impurity A ）
Tigecycline Impurity 6 Tigecycline Impurity 6
Febuxostat Bromo Impurity Febuxostat Bromo Impurity 144060-40-2 C15H16BrNO3S
Meptazinol Impurity Meptazinol Impurity 1314003-47-8 C23H28N2O4
1'H-2,3'-bipyridinyl-2'-one 1'H-2,3'-bipyridinyl-2'-one 101002-01-1 C10H8N2O
Brexpiprazole Impurity D Brexpiprazole Impurity D
Brivaracetam Impurity E Brivaracetam Impurity E
Dapoxetine Impurity 8 Dapoxetine Impurity 8
Irbesartan Impurity 6 Irbesartan Impurity 6 C25H28N6O
Empagliflozin impurity B Empagliflozin impurity B
Varenicline Impurity 1 Varenicline Impurity 1
Voriconazole Impurity 6 Voriconazole Impurity 6
Caspofungin impurity 1 Caspofungin impurity 1
Cabozantinib impurity D Cabozantinib impurity D
Neratinib Impurity 3 Neratinib Impurity 3
Ranitidine Impurity D Ranitidine Impurity D C13H22N4O3S
Metoprolol IMpurity 5 Metoprolol IMpurity 5 C15H25NO3
1-NaphthaleneMethanaMine, α-Methyl-N-[[3-(trifluoroMethyl)phenyl]Methyl]-, (αR)- 1-NaphthaleneMethanaMine, α-Methyl-N-[[3-(trifluoroMethyl)phenyl]Methyl]-, (αR)- 1229512-52-0 C20H18F3N
Benzoic acid, 2-[[[[(5S)-2-oxo-3-[4-(3-oxo-4-Morpholinyl)phenyl]-5-oxazolidinyl]Methyl]aMino]carbonyl]- Benzoic acid, 2-[[[[(5S)-2-oxo-3-[4-(3-oxo-4-Morpholinyl)phenyl]-5-oxazolidinyl]Methyl]aMino]carbonyl]- 1365267-37-3 C22H21N3O7
NSC 609249 NSC 609249 51012-67-0 C12H20ClNO2
1-[(4-Ethoxy-3-formylphenyl)sulfonyl]-4-methylpiperazine 1-[(4-Ethoxy-3-formylphenyl)sulfonyl]-4-methylpiperazine 332374-42-2 C14H20N2O4S
ApovincaMinic Acid Ethyl Ester N-Oxide ApovincaMinic Acid Ethyl Ester N-Oxide 109741-24-4 C22H26N2O3
Mirabegron Impurity 2 Mirabegron Impurity 2
Pemetrexed Impurity 1 Pemetrexed Impurity 1 1644287-26-2 C20H21N5O8
Plerixafor Impurity B Plerixafor Impurity B
Tolvaptan impurity3 Tolvaptan impurity3
Vonoprazan Impurity 7 Vonoprazan Impurity 7
Cefazolin impurity F Cefazolin impurity F
Apremilast Impurity 3 Apremilast Impurity 3 88687-92-7 C16H10N2O8
Apixaban Impurity 8 Apixaban Impurity 8 1777781-49-3 C24H23N5O4
Ritodrine BP Impurity D Ritodrine BP Impurity D
Rivaroxaban Impurity 19 Rivaroxaban Impurity 19
Topiroxostat Impurity 4 Topiroxostat Impurity 4 1379342-46-7 C8H8N2O3
Ertapenem impurity 1 Ertapenem impurity 1
(R)-2-(3-(diisopropylamino)-1-phenylpropyl)-4-(hydroxymethyl)phenyl methacrylate (R)-2-(3-(diisopropylamino)-1-phenylpropyl)-4-(hydroxymethyl)phenyl methacrylate C26H36NO3
Flomoxef Impurity 3 Flomoxef Impurity 3
Ropivacaine impurity Ropivacaine impurity 1105704-96-8 C12H14N2O3
Agomelatine Impurity 1 Agomelatine Impurity 1 1352139-51-5 C15H19NO2
Diquafosol Impurity 1 Diquafosol Impurity 1 26184-65-6 C18H24N4O17P2
Milnacipran Impurity 3 Milnacipran Impurity 3 1353644-50-4 C15H20ClNO
L-Glutamic acid 1-ethyl ester L-Glutamic acid 1-ethyl ester 52454-78-1 C7H13NO4
Methyl 2-Hydroxy-2-(Thiophen-2-Yl)-2-(Thiophen-3-Yl)Acetate Methyl 2-Hydroxy-2-(Thiophen-2-Yl)-2-(Thiophen-3-Yl)Acetate 28748-67-6 C11H10O3S2
6,7-Dihydro-N-methyl-N-[(3R,4R)-4-methyl-3-piperidinyl]-5H-pyrrolo[2,3-d]pyrimidin-4-amine 6,7-Dihydro-N-methyl-N-[(3R,4R)-4-methyl-3-piperidinyl]-5H-pyrrolo[2,3-d]pyrimidin-4-amine 1812890-23-5 C13H21N5
Sacubitril Impurity 72 Sacubitril Impurity 72 1361408-16-3 C23H27NO4
(1R,2S,3R)-Aprepitant (1R,2S,3R)-Aprepitant 1185502-97-9 C23H21F7N4O3
Clemastine Clemastine 108825-05-4 C21H26ClNO2
4-chloro-7-methoxyquinoline-6-carboxylic acid 4-chloro-7-methoxyquinoline-6-carboxylic acid 771464-30-3 C11H8ClNO3
ethyl (41S,13aR)-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 (41S,13aR)-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 85647-43-4 C22H26N2O2
methyl (41R,12R,13aR)-13a-ethyl-12-hydroxy-2,3,41,5,6,12,13,13a-octahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridine-12-carboxylate methyl (41R,12R,13aR)-13a-ethyl-12-hydroxy-2,3,41,5,6,12,13,13a-octahydro-1H-indolo[3,2,1-de]pyrido[3,2,1-ij][1,5]naphthyridine-12-carboxylate 38990-16-8 C21H26N2O3
Dolutegravir Impurity 3 Dolutegravir Impurity 3 1973402-05-9 C20H19F2N3O5
Cistracurium Besylate EP Impurity D Cistracurium Besylate EP Impurity D 1075726-88-3 C31H39NO9S
(R)-1-[3-[4-Amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]piperidin-1-yl]-3-chloropropan-1-one (R)-1-[3-[4-Amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3,4-d]pyrimidin-1-yl]piperidin-1-yl]-3-chloropropan-1-one 1288338-96-4 C25H25ClN6O2
Bendamustine Impurity 8 Bendamustine Impurity 8 1797881-48-1 C14H19Cl2N3O2
FeBuxostat Impurity 32 FeBuxostat Impurity 32 1805770-41-5 C12H12N2O
Edoxaban Impurity 9(1R,2S,4S) Edoxaban Impurity 9(1R,2S,4S) 2024614-15-9 C21H30ClN5O5
Rivaroxaban Impurity 22 Rivaroxaban Impurity 22 1350288-77-5 C19H18ClN3O5S
Rivaroxaban Impurity 27 Rivaroxaban Impurity 27 1369969-44-7 C21H21N3O5
Abiraterone Impurity 9 Abiraterone Impurity 9 165334-72-5 C24H31NO
Gliclazide Impurity A Gliclazide Impurity A
Medetomidine Impurity 14 Medetomidine Impurity 14 79924-14-4 C13H16N2
Tenofovir Disoproxil Impurity B Tenofovir Disoproxil Impurity B 36817-69-3 C8H11N5O
Ipragliflozin IMP Ipragliflozin IMP
2-Propanone, 1,3-bis(4-methoxyphenyl)- 2-Propanone, 1,3-bis(4-methoxyphenyl)- 29903-09-1 C17H18O3
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