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Pharmaceutical Impurity Reference Standards

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Structure Chemical Name CAS MF
(1S,2S,3R,5S)-3-(7-chloro-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-chloro-5-(propylthio)-3H-[1,2,3]triazolo[4,5-d]pyriMidin-3-yl)-5-(2-hydroxyethoxy)cyclopentane-1,2-diol C14H20ClN5O4S
Posaconazole iMpurity 5 Posaconazole iMpurity 5
APST-ZA APST-ZA 635705-72-5 C20H22N2O6S
Topiroxostat Impurity 5 Topiroxostat Impurity 5 1199273-82-9 C14H7N7
N-Ethoxycarbonyl Ciprofloxacin N-Ethoxycarbonyl Ciprofloxacin 93594-29-7 C20H22FN3O5
Norepinephrine Tartrate Impurity G Norepinephrine Tartrate Impurity G 13062-58-3 C22H21NO3
Vortioxetine Impurity 1 Vortioxetine Impurity 1 1293489-71-0 C17H20N2S
4-bromo-2-nitropyridine 4-bromo-2-nitropyridine 909712-10-3 C5H3BrN2O2
Acemetacin Impurity F Acemetacin Impurity F
1,3-Bis(1H-1,2,4-triazol-1-yl)-2-propanone 1,3-Bis(1H-1,2,4-triazol-1-yl)-2-propanone 98414-56-3 C7H8N6O
2-[[(3aR,4S,6R,6aS)-6-(7-azanyl-5-propylsulfanyl-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl)-2,2-dimethyl-4,5,6,6a-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl]oxy]ethanol 2-[[(3aR,4S,6R,6aS)-6-(7-azanyl-5-propylsulfanyl-[1,2,3]triazolo[4,5-d]pyrimidin-3-yl)-2,2-dimethyl-4,5,6,6a-tetrahydro-3aH-cyclopenta[d][1,3]dioxol-4-yl]oxy]ethanol 1354945-69-9 C17H26N6O4S
Vonoprazan Impurity E Vonoprazan Impurity E
Disalicylimide Disalicylimide 1972-71-0 C14H11NO4
Atomoxetine impurity D Atomoxetine impurity D 1643684-02-9 C17H21NO
(2S,4S)-5-(Biphenyl-4-yl)-4-[(3-carboxypropionyl)amino]-2-methylpentanoic acid ethyl ester,calcium salt(2:1) (2S,4S)-5-(Biphenyl-4-yl)-4-[(3-carboxypropionyl)amino]-2-methylpentanoic acid ethyl ester,calcium salt(2:1)
(41S,12S,13aS)-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-carboxylic acid (41S,12S,13aS)-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-carboxylic acid 59413-21-7 C20H25N2NaO3
BDJS-SH 1 BDJS-SH 1 36588-45-1 C12H18N2O2
Acyclovir Impurity O Acyclovir Impurity O
Alogliptin Impurity 19 Alogliptin Impurity 19
Alogliptin Impurity 19 Alogliptin Impurity 19
Aprepitant Impurity 17 Aprepitant Impurity 17 1333998-27-8 C20H19ClF7NO2
Blonanserin impurity A Blonanserin impurity A
Captopril impurity 2 Captopril impurity 2
Ciprofloxacin Impurity D HCl Ciprofloxacin Impurity D HCl 526204-10-4 C17H18FN3O3
Clindamycin Impurity 6 Clindamycin Impurity 6
Dabigatran Impurity 5 Dabigatran Impurity 5
DecitaBine Impurity 10 DecitaBine Impurity 10
Empagliflozin Impurity 17 Empagliflozin Impurity 17 2452301-27-6 C23H28O7
Erlotinib Impurity 31 Erlotinib Impurity 31
Everolimus impurity C Everolimus impurity C
Ezetimibe Impurity 28 Ezetimibe Impurity 28
FeBuxostat Impurity 30 FeBuxostat Impurity 30
Fluconazole Impurity 5 Fluconazole Impurity 5 94952-36-0 C13H12F2N6O
Fosaprepitant Impurity 2 Fosaprepitant Impurity 2
Imidafenacin Impurity 4 Imidafenacin Impurity 4 503598-78-5 C16H18N2O
Intedanib Impurity H Intedanib Impurity H
Isavuconazole Impurity 16 Isavuconazole Impurity 16
Isavuconazole Impurity 4 Isavuconazole Impurity 4
Lenvatinib Impurity 4 Lenvatinib Impurity 4 C28H22ClN5O5
Linagliptin Impurity 45 Linagliptin Impurity 45
MiraBegron Impurity F MiraBegron Impurity F
Moxifloxacin Impurity 19 Moxifloxacin Impurity 19
Moxifloxacin Impurity 34 Moxifloxacin Impurity 34 1824286-08-9 C9H7ClF2O3
Nifedipine Impurity J Nifedipine Impurity J 114709-68-1 C16H17N3O5
Oxiracetam Impurity I Oxiracetam Impurity I 142274-07-5 C7H9NO4
PalBociclib Impurity 4 PalBociclib Impurity 4
Plerixafor Impurity 4 Plerixafor Impurity 4
Posaconazole Impurity 29 Posaconazole Impurity 29
Posaconazole Impurity 34 Posaconazole Impurity 34
Posaconazole Impurity 58 Posaconazole Impurity 58
Pregabalin Impurity 4 Pregabalin Impurity 4 1955498-14-2 C10H22ClNO2
Rabeprazole Impurity 17 Rabeprazole Impurity 17
SofosBuvir Impurity 14 SofosBuvir Impurity 14
sofosBuvir Impurity 34 sofosBuvir Impurity 34
1-(2-amino-4,5-dimethoxyphenyl)ethan-1-one 1-(2-amino-4,5-dimethoxyphenyl)ethan-1-one 1071574-51-0 C10H13NO3
(+)-epipinoresinol-4-O-β-D-glucoside (+)-epipinoresinol-4-O-β-D-glucoside 74983-66-7 C26H32O11
2-[3-Methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinyl]methylthio-1H-benzimidazole 2-[3-Methyl-4-(2,2,2-trifluoroethoxy)-2-pyridinyl]methylthio-1H-benzimidazole 103577-40-8 C16H14F3N3OS
Ethyl (3E)-3-(2-phenylhydrazin-1-ylidene)butanoate Ethyl (3E)-3-(2-phenylhydrazin-1-ylidene)butanoate 6078-46-2 C12H16N2O2
1-(5,6-dihydronaphthalen-1-yl)ethan-1-amine hydrochloride 1-(5,6-dihydronaphthalen-1-yl)ethan-1-amine hydrochloride 1824506-44-6 C12H15N
(S)-4-(4-((3-amino-2-hydroxypropyl)amino)phenyl)morpholin-3-one hydrochloride (S)-4-(4-((3-amino-2-hydroxypropyl)amino)phenyl)morpholin-3-one hydrochloride 1403383-55-0 C13H20ClN3O3
Terbutaline Impurity Terbutaline Impurity 882066-15-1 C33H35NO3.H2O4S
Bis(4-fluorobenzyl)aMine Bis(4-fluorobenzyl)aMine 646051-52-7 C14H13F2N
2-(2-butyl-4-methyl-1-((2'-(1-methyl- 1H-tetrazol-5-yl)-[1,1'-biphenyl]-4- yl)methyl)-6-oxo-1,6- dihydropyrimidin-5-yl)-N,Ndimethylethanethioamide 2-(2-butyl-4-methyl-1-((2'-(2-methyl- 2H-tetrazol-5-yl)-[1,1'-biphenyl]-4- yl)methyl)-6-oxo-1,6- dihydropyri 2-(2-butyl-4-methyl-1-((2'-(1-methyl- 1H-tetrazol-5-yl)-[1,1'-biphenyl]-4- yl)methyl)-6-oxo-1,6- dihydropyrimidin-5-yl)-N,Ndimethylethanethioamide 2-(2-butyl-4-methyl-1-((2'-(2-methyl- 2H-tetrazol-5-yl)-[1,1'-biphenyl]-4- yl)methyl)-6-oxo-1,6- dihydropyri
SofosBuvir Impurity 50 SofosBuvir Impurity 50
SofosBuvir Impurity 56 SofosBuvir Impurity 56
Tofacitinib impurity T Tofacitinib impurity T 1092578-43-2 C16H20N6O
Valsartan Impurity 39 Valsartan Impurity 39 C24H29N5O3
Donepezil Impurity Donepezil Impurity 844694-84-4 C24H31NO2
imp.E imp.E 950781-89-2 C13H12F3N3O3
Lidocaine EP Impurity Lidocaine EP Impurity 31785-64-5 C12H18N2O.ClH
Prucalopride Impurity 1 Prucalopride Impurity 1 1900715-96-9 C18H24ClN3O3
3-(5-CHLOROPYRID-2-YL)CARBAMOYLPYRAZINE-2-CARBOXYLIC ACID(WXG01564) 3-(5-CHLOROPYRID-2-YL)CARBAMOYLPYRAZINE-2-CARBOXYLIC ACID(WXG01564) 43200-83-5 C11H7ClN4O3
Ampicillin Impurity Q Ampicillin Impurity Q
Cefdinir Impurity PQ(CP) Cefdinir Impurity PQ(CP)
Cefdinir Impurity IJKL Cefdinir Impurity IJKL
Ceftazidime Impurity A (EP) Ceftazidime Impurity A (EP)
Oxacillin Sodium Impurity E(EP) Oxacillin Sodium Impurity E(EP)
Spectinomycin Impurity B Spectinomycin Impurity B
Eriodictyol-8-glucoside Eriodictyol-8-glucoside 153733-96-1 C21H22O11
Naringin 4'-glucoside Naringin 4'-glucoside 17257-21-5 C33H42O19
8-(benzo[b]thiophen-4-yl)-5,8-diazaspiro[4.5]decan-5-ium chloride 8-(benzo[b]thiophen-4-yl)-5,8-diazaspiro[4.5]decan-5-ium chloride 2143944-64-1 C16H21N2S+
2-(4'-chloro-2,3,4,5-tetrahydro-[1,1'-biphenyl]-4-yl)-3-hydroxynaphthalene-1,4-dione 2-(4'-chloro-2,3,4,5-tetrahydro-[1,1'-biphenyl]-4-yl)-3-hydroxynaphthalene-1,4-dione 1809464-27-4 C22H17ClO3
Aprepitant impurity C Aprepitant impurity C
Ticagrelor Related Compound 14 Ticagrelor Related Compound 14 2056269-94-2 C23H28F2N6O4S
Cefoxitin impurity E Cefoxitin impurity E 2395025-32-6 C17H19N3O8S2
N-((4-(3-methyl-5-phenylisoxazol-4-yl)phenyl)sulfonyl)propionamide N-((4-(3-methyl-5-phenylisoxazol-4-yl)phenyl)sulfonyl)propionamide 477594-28-8 C19H18N2O4S
Moxifloxacin EP Impurity D HCl Moxifloxacin EP Impurity D HCl
Moxifloxacin Impurity 30 Moxifloxacin Impurity 30 1395056-42-4 C21H24FN3O7
Tenofovir Impurity 37 Tenofovir Impurity 37 161760-03-8 C10H15O6PS
Apremilast Apremilast 1384967-20-7 C20H20N2O7S
Pramipexole Impurity 30 Pramipexole Impurity 30 1802051-36-0 C13H24ClN3S
NZWJKTHFNLHUJO-NWZSJJIMSA-N NZWJKTHFNLHUJO-NWZSJJIMSA-N 1422954-12-8 C22H26FN3O5S
LAT-NET LAT-NET 607351-44-0 C25H39NO4
N,N-(ethane-1,2-diyl)bis(4-methyl-N-(3-((4-methylphenyl)sulfonamido)propyl)benzenesulfonamide) N,N-(ethane-1,2-diyl)bis(4-methyl-N-(3-((4-methylphenyl)sulfonamido)propyl)benzenesulfonamide) 74676-47-4 C36H46N4O8S4
L-GLUCONO-1,5-LACTONE L-GLUCONO-1,5-LACTONE 52153-09-0 C6H10O6
C-Desmethyl Atenolol C-Desmethyl Atenolol 1797116-92-7 C13H20N2O3
Losartan Impurity 7 Losartan Impurity 7 358685-13-9 C33H24Br2N4
Fenofibric Acid 1-Carboxyl-1-methylethyl Ester Fenofibric Acid 1-Carboxyl-1-methylethyl Ester 1797121-54-0 C21H21ClO6
2-Chloro-4'-fluorobenzophenone 2-Chloro-4'-fluorobenzophenone 1806-23-1 C13H8ClFO
Ambrisentan Impurity E Ambrisentan Impurity E 1312092-82-2 C21H18N2O3
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