Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
5a-17-(3-Pyridyl)-16-androstene-3-one 5a-17-(3-Pyridyl)-16-androstene-3-one C24H31NO
AMpicillin EP IMpurity E AMpicillin EP IMpurity E
Anastrozole IMpurity (2-(3-((1H-1,2,4-triazol-1-yl)Methyl)-5-(1-aMino-2-Methyl-1-oxopropan-2-yl)phenyl)-2-Methylpropanoi Anastrozole IMpurity (2-(3-((1H-1,2,4-triazol-1-yl)Methyl)-5-(1-aMino-2-Methyl-1-oxopropan-2-yl)phenyl)-2-Methylpropanoi
Anastrozole IMpurity (2-(3-((1H-1,2,4-triazol-1-yl)Methyl)-5-(1-aMino-2-Methyl-1-oxopropan-2-yl)phenyl)-2-Methylpropanoi Anastrozole IMpurity (2-(3-((1H-1,2,4-triazol-1-yl)Methyl)-5-(1-aMino-2-Methyl-1-oxopropan-2-yl)phenyl)-2-Methylpropanoi
AtracuriuM IMpurity H (Mixture of cis, trans(H1), cis, cis(H2)
 tans, trans IsoMer) AtracuriuM IMpurity H (Mixture of cis, trans(H1), cis, cis(H2) tans, trans IsoMer) 1248429-33-5
Ceftriaxone IMpurit B Ceftriaxone IMpurit B
Flucloxacillin IMpurity F Flucloxacillin IMpurity F
IMidafenacin IMpurity (1-(3-Cyano-3,3-Diphenylpropyl)-2-Methyl-1H-IMidazoliuM Phosphate) IMidafenacin IMpurity (1-(3-Cyano-3,3-Diphenylpropyl)-2-Methyl-1H-IMidazoliuM Phosphate) 562091-56-9 C20H22N3O4P
Lercanidipine IMpurity B Lercanidipine IMpurity B 1119226-97-9 C35 H37 N3 O6
Milrinone IMpurity 2 Milrinone IMpurity 2 400063-10-7 C12H7N3O2
Moxifloxacin Decarboxy Analog Moxifloxacin Decarboxy Analog 1322062-57-6 C20H24FN3O2
Naratriptan IMpurity E Naratriptan IMpurity E 1346746-73-3 C20H32N4O4S2
PraMipexole DiMer IMpurity II PraMipexole DiMer IMpurity II 2206826-82-4 C20H32N6S2
Rosuvastatin Substituted Hydroxy Pentenoic Acid Rosuvastatin Substituted Hydroxy Pentenoic Acid 910867-11-7 C20H24FN3O5S
EthanediaMide  iMpurity k EthanediaMide iMpurity k 2803419-58-9 C2H4N2O2
(1S,2S,3R,5S)-3-(7-hydroxy-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol (1S,2S,3R,5S)-3-(7-hydroxy-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol 1445580-43-7 C14H21N5O5S
D-threo-Pentitol, 2,5-anhydro-1,3,4-trideoxy-2-C-(2,4-difluorophenyl)-4-(hydroxyMethyl)-1-(1H-1,2,4-triazol-1-yl)- D-threo-Pentitol, 2,5-anhydro-1,3,4-trideoxy-2-C-(2,4-difluorophenyl)-4-(hydroxyMethyl)-1-(1H-1,2,4-triazol-1-yl)- 160709-02-4 C14H15F2N3O2
Bivalirudin iMpurity Bivalirudin iMpurity 72378-50-8 C6H8N2O4
2-(4-tert-Butyl-3-hydroxy-2,6-dimethylphenyl)acetic acid 2-(4-tert-Butyl-3-hydroxy-2,6-dimethylphenyl)acetic acid 55699-12-2 C14H20O3
(S)-Fesoterodine FuMarate (S)-Fesoterodine FuMarate 1431511-18-0 C30H41NO7
(3S)-10-(4-Ethyl-1-piperazinyl)-9-fluoro-2,3-dihydro-3-Methyl-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid (Levofloxacin IMpurity) (3S)-10-(4-Ethyl-1-piperazinyl)-9-fluoro-2,3-dihydro-3-Methyl-7-oxo-7H-pyrido[1,2,3-de]-1,4-benzoxazine-6-carboxylic Acid (Levofloxacin IMpurity) 106939-30-4 C19H22FN3O4
(6S,12bR)-6-(1,3-Benzodioxol-5-yl)-2,3,7,12b-tetrahydro-2-Methyl-pyrazino[1',2':1,5]pyrrolo[3,4-b]quinoline-1,4,12(6H)-trione (6S,12bR)-6-(1,3-Benzodioxol-5-yl)-2,3,7,12b-tetrahydro-2-Methyl-pyrazino[1',2':1,5]pyrrolo[3,4-b]quinoline-1,4,12(6H)-trione 531500-48-8 C22H17N3O5
1-(3,5-Dihydroxyphenyl)-2-[(1,1-diMethylethyl)(phenylMethyl)aMino]ethanone HydrobroMide 1-(3,5-Dihydroxyphenyl)-2-[(1,1-diMethylethyl)(phenylMethyl)aMino]ethanone HydrobroMide 94109-61-2 C19H23NO3
2-Methyl-5-(3-(4-(Methylsulfonyl)phenyl)furan-2-yl)pyridine 2-Methyl-5-(3-(4-(Methylsulfonyl)phenyl)furan-2-yl)pyridine 307531-96-0 C17H15NO3S
3-(1,4-Dihydro-5-Methyl-4-oxo-7-propyliMidazo[5,1-f][1,2,4]triazin-2-yl)-4-ethoxybenzenesulfonic Acid 3-(1,4-Dihydro-5-Methyl-4-oxo-7-propyliMidazo[5,1-f][1,2,4]triazin-2-yl)-4-ethoxybenzenesulfonic Acid 437717-43-6 C17H20N4O5S
3-[5-(1,5-Dioxo-5-(p-fluophenylpentyl]-4R-phenyl-2-oxazolidinone 3-[5-(1,5-Dioxo-5-(p-fluophenylpentyl]-4R-phenyl-2-oxazolidinone 404874-93-7 C20H18FNO4
5-[Bis(2-chloroethyl)aMino]-1-Methyl-1H-benziMidazole-2-butanoic Acid Methyl Ester 5-[Bis(2-chloroethyl)aMino]-1-Methyl-1H-benziMidazole-2-butanoic Acid Methyl Ester 109882-25-9 C17H23Cl2N3O2
Caspofungin IMpurity A Caspofungin IMpurity A 1202167-57-4 C51H86N10O15
DesdifluoroMethoxy Hydroxy Pantoprazole DesdifluoroMethoxy Hydroxy Pantoprazole 1261238-06-5 C15H15N3O4S
Levofloxacin Hydroxy Acid Levofloxacin Hydroxy Acid 1036016-10-0 C18H21F2N3O4
N-(4,5-Dihydro-1H-iMidazol-2-yl)-6-quinoxalinaMine N-(4,5-Dihydro-1H-iMidazol-2-yl)-6-quinoxalinaMine 91147-43-2 C11H11N5
Nor Lidocaine Hydrochloride Nor Lidocaine Hydrochloride 7729-94-4 C12H19ClN2O
rel-(1R,3S,5S)-8-Methyl-8-azabicyclo[3,2,1]oct-6-en-yl-2-hydroxy-2,2-dithiophen-2-yl acetate rel-(1R,3S,5S)-8-Methyl-8-azabicyclo[3,2,1]oct-6-en-yl-2-hydroxy-2,2-dithiophen-2-yl acetate 136310-66-2 C18H19NO3S2
(11β)-17-(Acetyloxy)-11-[4-(diMethylaMino)phenyl]-3-hydroxy-19-norpregna-1,3,5(10)-trien-20-one (11β)-17-(Acetyloxy)-11-[4-(diMethylaMino)phenyl]-3-hydroxy-19-norpregna-1,3,5(10)-trien-20-one 709615-25-8 C30H37NO4
4-[4-[4-(Diphenylmethylene)-1-piperidinyl]-1-hydroxybutyl]-α,α-dimethyl-benzeneacetic Acid 4-[4-[4-(Diphenylmethylene)-1-piperidinyl]-1-hydroxybutyl]-α,α-dimethyl-benzeneacetic Acid 1187954-57-9 C32H37NO3
(2S,3R,4R,5S)-1-(2-hydroxyethyl)-2-(hydroxymethyl)-3,4,5-Piperidinetriol Hydrochloride (2S,3R,4R,5S)-1-(2-hydroxyethyl)-2-(hydroxymethyl)-3,4,5-Piperidinetriol Hydrochloride 1370331-33-1 C8H17NO5
(3S,5R)-Rosuvastatin (3S,5R)-Rosuvastatin 1242184-42-4 C22H28FN3O6S
(S)-5-(2-AMinopropyl)-2-MethoxybenzenesulfonaMide (S)-5-(2-AMinopropyl)-2-MethoxybenzenesulfonaMide 119714-13-5 C10H16N2O3S
Afatinib IMpurity I Afatinib IMpurity I 1637254-93-3 C22H19BrClFN4O3
Afatinib IMpurity I Afatinib IMpurity I 1637254-93-3 C22H19BrClFN4O3
Aripiprazole iMpurity 2 Aripiprazole iMpurity 2 1424857-93-1 C14H18Cl2N2
Aripiprazole iMpurity 2 Aripiprazole iMpurity 2 1424857-93-1 C14H18Cl2N2
Avanafil IMpurity 6 Avanafil IMpurity 6
Cefoxitin iMpurity F (S-Methoxy cefoxitin) Cefoxitin iMpurity F (S-Methoxy cefoxitin)
Clopidogrel IMpurity 1 Clopidogrel IMpurity 1 C15H14ClNO2S
LincoMycin iMpurity A LincoMycin iMpurity A
Posaconazole iMpurity 1 Posaconazole iMpurity 1
Riociguat IMpurtiy Riociguat IMpurtiy 2920299-23-4
TelMisartan IMpurity E TelMisartan IMpurity E
IverMectin B1 Mono-sugar Derivative IverMectin B1 Mono-sugar Derivative 71837-27-9 C41H62O11
Desethyl Acetate (E)-CefuroxiMe Axetil Desethyl Acetate (E)-CefuroxiMe Axetil 97232-97-8 C16H16N4O8S
6-AMino-5-azacytidine 6-AMino-5-azacytidine 105331-00-8 C8H13N5O5
N-Methyl-3-phenylpropan-1-aMine hydrochloride
(RelCpd B) N-Methyl-3-phenylpropan-1-aMine hydrochloride (RelCpd B) 30684-07-2 C10H16ClN
1-[2-[(2,6-diMethylphenyl)thio]phenyl]- Piperazine 1-[2-[(2,6-diMethylphenyl)thio]phenyl]- Piperazine 508233-76-9 C18H22N2S
2-Hexenoic acid, 2-cyano-5-methyl- 2-Hexenoic acid, 2-cyano-5-methyl- 869-02-3 C8H11NO2
CP-690550A CP-690550A 1243290-37-0 C15H21N5O2
(S)-Tomoxetine (S)-Tomoxetine 105314-53-2 C17H21NO
Fexofenadine EP Impurity F Fexofenadine EP Impurity F 185066-33-5 C31H37NO4
(E)-2-(7-methoxy-3,4-dihydronaphthalen-1(2H)-ylidene)ethan-1-amine (E)-2-(7-methoxy-3,4-dihydronaphthalen-1(2H)-ylidene)ethan-1-amine 468104-18-9 C13H17NO
4-(5-(pyridin-4-yl)-1H-1,2,4-triazol-3-yl)picolinamide 4-(5-(pyridin-4-yl)-1H-1,2,4-triazol-3-yl)picolinamide 1992028-94-0 C13H10N6O
Indacaterol Impurity 22 Indacaterol Impurity 22 773895-24-2 C31H34N2O3
10-O-2,2-Dichloroethoxycarbonyl Docetaxe 10-O-2,2-Dichloroethoxycarbonyl Docetaxe 158810-73-2 C46H55Cl2NO16
4R,5S)-2,4-diphenyl-4,5-dihydrooxazole-5-carboxylic acid 4R,5S)-2,4-diphenyl-4,5-dihydrooxazole-5-carboxylic acid 849831-77-2 C16H13NO3
PDXA-226 PDXA-226 352637-51-5 C14H14N2O
Ropivacaine-ET-R Ropivacaine-ET-R 98626-60-9 C16H24N2O
Ropivacaine-iPr-S Ropivacaine-iPr-S 265120-58-9 C17H26N2O
(S)-N,N-dimethyl-3-(naphthalen-1-yloxy)-3-(thiophen-3-yl)propan-1-amine (S)-N,N-dimethyl-3-(naphthalen-1-yloxy)-3-(thiophen-3-yl)propan-1-amine 1384080-33-4 C19H21NOS
methyl 4-(5-methyl-3-phenylisoxazol-4-yl)benzenesulfonate methyl 4-(5-methyl-3-phenylisoxazol-4-yl)benzenesulfonate C17H15NO4S
Apremilast impurity 15 Apremilast impurity 15
Aprepitant Impurity 22 Aprepitant Impurity 22 934540-48-4 C20H16F7NO2
Aprepitant Impurity 9 Aprepitant Impurity 9 219821-37-1 C24H25F7N4O4
Betamethasone EP Impurity I Betamethasone EP Impurity I 185613-69-8 C22H29FO5
Canagliflozin Impurity 14 Canagliflozin Impurity 14 842133-17-9 C24H25FO5S
Carfilzomib Impurity F Carfilzomib Impurity F
Cefamandole Impurity A Cefamandole Impurity A 1947364-12-6 C17H16N2O6S
Dapagliflozin Impurity 19 Dapagliflozin Impurity 19 1469910-84-6 C29H33ClO10
Docetaxel EP Impurity A Docetaxel EP Impurity A
Empagliflozin Impurity 21 Empagliflozin Impurity 21
Febuxostat Impurity 43 Febuxostat Impurity 43
Formoterol Impurity 20 Formoterol Impurity 20
Hydroxychloroquine Impurity 2 Hydroxychloroquine Impurity 2
Ibrutinib Impurity 14 Ibrutinib Impurity 14 2417548-76-4 C50H48N12O4
Imatinib impurity 11 Imatinib impurity 11
Isavuconazole Impurity 2 Isavuconazole Impurity 2 2001051-99-4 C13H12F2N4O
Isavuconazole Impurity 25 Isavuconazole Impurity 25
Loxoprofen Impurity 18 Loxoprofen Impurity 18 99807-54-2 C11H13BrO2
Mupirocin EP Impurity D Mupirocin EP Impurity D 71087-97-3 C26H44O9
Olaparib Impurity 3 Olaparib Impurity 3
Posaconazole Impurity 33 Posaconazole Impurity 33 182210-71-5 C12H13F2IO2
Posaconazole Impurity 38 Posaconazole Impurity 38
Posaconazole Impurity 62 Posaconazole Impurity 62
Roxithromycin Impurity J Roxithromycin Impurity J
Sitagliptin Impurity 21 Sitagliptin Impurity 21 2088771-60-0 C20H19F6N5O5
SofosBuvir Impurity 38 SofosBuvir Impurity 38
SofosBuvir Impurity 61 SofosBuvir Impurity 61
Suvorexant Impurity 2 Suvorexant Impurity 2 1276666-19-3 C23H23ClN6O2
Tenofovir impurity L Tenofovir impurity L
Ticagrelor Impurity 27 Ticagrelor Impurity 27 1402150-01-9 C19H26ClN5O5S
Ticagrelor impurity P Ticagrelor impurity P
Tramadol Impurity 1 Tramadol Impurity 1 66170-32-9 C16H25NO2
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