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Pharmaceutical Reference Standards

USP - United States Pharmacopeia Pharmaceutical Analytical Impurities

457 products found

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USP-1A00300

Dexamethasone Formate (COLD SHIPMENT REQUIRED) ((8S,9R,10S,11S,13S,14S,16R,17R)-9-fluoro-17-(formyloxy)-11-hydroxy-10,13,16-trimethyl-3-oxo-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthrene-17-carboxylic acid)

Item no.

USP-1A00300

CAS Number

[473273-04-0]

Unit

25 mg

Molecular formula

C22H27FO6

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USP-1A00370

R-Levetiracetam Hydroxybutyramide Analog ((R)-N-(1-amino-1-oxobutan-2-yl)-4-hydroxybutanamide)

Item no.

USP-1A00370

CAS Number

[1847568-87-9]

Unit

10 mg

Molecular formula

C8H16N2O3

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USP-1A00430

Clopidogrel Open Ring Methyl Ester Hydrochloride (methyl 2-(2-chlorophenyl)-2-((2-(thiophen-2-yl)ethyl)amino)acetate, hydrochloride)

Item no.

USP-1A00430

CAS Number

[141109-18-4]

Unit

10 mg

Molecular formula

C15H16ClNO2S·HCl

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USP-1A00450

Pyrazinediethanol (2,2'-(pyrazine-2,5-diyl)bis(ethan-1-ol))

Item no.

USP-1A00450

CAS Number

[4744-51-8]

Unit

10 mg

Molecular formula

C8H12N2O2

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USP-1A00550

(R)-Clopidogrel Carboxylic Acid ((R)-2-(2-chlorophenyl)-2-(6,7-dihydrothieno[3,2-c]pyridin-5(4H)-yl)acetic acid)

Item no.

USP-1A00550

CAS Number

[324757-50-8]

Unit

10 mg

Molecular formula

C15H14ClNO2S

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USP-1A00670

Rivaroxaban Open Ring ((R)-5-chloro-N-(2-hydroxy-3-((4-(3-oxomorpholino)phenyl)amino)propyl)thiophene-2-carboxamide)

Item no.

USP-1A00670

CAS Number

[721401-53-2]

Unit

10 mg

Molecular formula

C18H20ClN3O4S

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USP-1A00731

Fexofenadine Olefin (2-(4-(4-(4-(diphenylmethylene)piperidin-1-yl)-1-hydroxybutyl)phenyl)-2-methylpropanoic acid)

Item no.

USP-1A00731

CAS Number

[1187954-57-9]

Unit

25 mg

Molecular formula

C32H37NO3

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USP-1A00820

Atorvastatin Pyrrolidone Lactone (5-(4-Fluorophenyl)-1-{2-[(2R,4R)-4-hydroxy-6-oxotetrahydro-2H-pyran-2-yl]ethyl}-3-isopropyl-2-oxo-N,4-diphenyl-2,3-dihydro-1H-pyrrole-3-carboxamide)

Item no.

USP-1A00820

CAS Number

[906552-19-0]

Unit

25 mg

Molecular formula

C33H33FN2O5

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USP-1A00840

3'-Demethyl-3'-N-[(4-methylphenyl)sulfonyl]azithromycin

Item no.

USP-1A00840

CAS Number

[612069-31-5]

Unit

25 mg

Molecular formula

C44H76N2O14S

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USP-1A00850

Azithromycin B (3-deoxyazithromycin) (COLD SHIPMENT REQUIRED)

Item no.

USP-1A00850

CAS Number

[307974-61-4]

Unit

25 mg

Molecular formula

C38H72N2O11

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USP-1A00860

Azithromycin C (3''-O-demethylazithromycin)

Item no.

USP-1A00860

CAS Number

[620169-47-3]

Unit

25 mg

Molecular formula

C37H70N2O12

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USP-1A01070

Alpha-Naphthol (Naphthalen-1-ol)

Item no.

USP-1A01070

CAS Number

[90-15-3]

Unit

25 mg

Molecular formula

C10H8O

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USP-1A01120

Fluticasone sulfenic acid ((6S,8S,9R,10S,11S,13S,14S,16R,17R)-6,9-difluoro-11-hydroxy-10,13,16-trimethyl-3-oxo-17-(propionyloxy)-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthrene-17-carbo(thioperoxoic )O-acid)

Item no.

USP-1A01120

CAS Number

[948566-12-9]

Unit

25 mg

Molecular formula

C24H30F2O6S

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USP-1A01150

Pemetrexed Glutamide Sodium ((S)-4-((S)-4-(4-(2-(2-amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl)benzamido)-4-carboxybutanamido)-4-carboxybutanoate, sodium salt)

Item no.

USP-1A01150

CAS Number

[144051-68-3] (free acid)

Unit

25 mg

Molecular formula

C25H27N6O9. Na

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USP-1A01190

Rivaroxaban N-acyl glycolic acid ((S)-2-(2-(5-chloro-N-(4-(5-((5-chlorothiophene-2-carboxamido)methyl)-2-oxooxazolidin-3-yl)phenyl)thiophene-2-carboxamido)ethoxy)acetic acid)

Item no.

USP-1A01190

CAS Number

[1151893-81-0]

Unit

25 mg

Molecular formula

C24H21Cl2N3O7S2

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USP-1A01270

16Alpha-Hydroxy Prednisolone-9(11)-ene Acetate (2-((8S,10S,13S,14S,16R,17S)-16,17-dihydroxy-10,13-dimethyl-3-oxo-6,7,8,10,12,13,14,15,16,17-decahydro-3H-cyclopenta[a]phenanthren-17-yl)-2-oxoethyl acetate)

Item no.

USP-1A01270

CAS Number

[77017-20-0]

Unit

25 mg

Molecular formula

C23H28O6

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USP-1A01430

Clopidogrel Piperidinylidene Analog ((E)-2-(1-(1-(2-chlorophenyl)-2-methoxy-2-oxoethyl)-4-((2-(3-methoxyphenyl)-2-oxoethyl)thio)piperidin-3-ylidene)acetic acid)

Item no.

USP-1A01430

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C25H26ClNO6S

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USP-1A01650

3-Hydroxy Desloratadine (8-chloro-11-(piperidin-4-ylidene)-6,11-dihydro-5H-benzo[5,6] cyclohepta[1,2-b]pyridin-3-ol)

Item no.

USP-1A01650

CAS Number

[119410-08-1]

Unit

25 mg

Molecular formula

C19H19ClN2O

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USP-1A01710

Methyl 2-chloro-Beta-D-phenylalanine (methyl (R)-2-amino-2-(2-chlorophenyl)acetate, hydrochloride)

Item no.

USP-1A01710

CAS Number

[212838-70-5]

Unit

25 mg

Molecular formula

C9H10ClNO2.HCl

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USP-1A01740

Desfluorociprofloxacin Hydrochloride (1-cyclopropyl-4-oxo-7-(piperazin-1-yl)-1,4-dihydroquinoline-3-carboxylic acid, hydrochloride)

Item no.

USP-1A01740

CAS Number

[2727369-47-1]

Unit

25 mg

Molecular formula

C17H19N3O3. HCl

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USP-1A01760

Escitalopram Open Ring (4-[4-(Dimethylamino)-1-(4-fluorophenyl)-1-hydroxybutyl]-3-(hydroxymethyl)benzonitrile)

Item no.

USP-1A01760

CAS Number

[103146-25-4]

Unit

25 mg

Molecular formula

C20H23FN2O2

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USP-1A01790

N-Methyl Lacosamide ((R)-2-(N-methylacetamido)-N-benzyl-3-methoxypropanamide)

Item no.

USP-1A01790

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C14H20N2O3

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USP-1A01850

Tetrahydrothienopyridine Hydrochloride (4,5,6,7-Tetrahydrothieno[3,2-c]pyridine, hydrochloride)

Item no.

USP-1A01850

CAS Number

[28783-41-7]

Unit

25 mg

Molecular formula

C7H9NS. HCl

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USP-1A01970

(R)-Amlodipine 3-ethyl 5-methyl (R)-2-((2-aminoethoxy)methyl)-4-(2-chlorophenyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate)

Item no.

USP-1A01970

CAS Number

[103129-81-3]

Unit

25 mg

Molecular formula

C20H25ClN2O5

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USP-1A02000

Budesonide Pyruvic Acid (2-((6aR,6bS,7S,8aS,8bS,11aR,12aS,12bS)-7-hydroxy-6a,8a-dimethyl-4-oxo-10-propyl-1,2,4,6a,6b,7,8,8a,11a,12,12a,12b-dodecahydro-8bH-naphtho[2',1':4,5]indeno[1,2-d][1,3]dioxol-8b-yl)-2-oxoacetic acid)

Item no.

USP-1A02000

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C25H32O7

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USP-1A02010

17alpha-Hydroxy13(17)a-homoprednisolone ((2R,3R,4aS,4bS,10aR,10bS,11S,12aS)-2,3,11-trihydroxy-2-(hydroxymethyl)-10a,12a-dimethyl-3,4,4a,5,6,10a,10b,11,12,12a-decahydrochrysene-1,8(2H,4bH)-dione)

Item no.

USP-1A02010

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C21H28O6

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USP-1A02040

(4-Methylbenzoyl)trifluoroacetone (1,1,1-Trifluoro-4-hydroxy-4-(4-methylphenyl)-3-buten-2-one)

Item no.

USP-1A02040

CAS Number

[910303-54-7]

Unit

25 mg

Molecular formula

C11H9F3O2

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USP-1A02190

Duloxetine Phthalamide ((S)-2-(methyl(3-(naphthalen-1-yloxy)-3-(thiophen-2-yl)propyl)carbamoyl)benzoic acid)

Item no.

USP-1A02190

CAS Number

[199191-67-8]

Unit

25 mg

Molecular formula

C26H23NO4S

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USP-1A02250

Rivaroxaban Ethyl Carbamate (ethyl (4-(3-oxomorpholino)phenyl)carbamate)

Item no.

USP-1A02250

CAS Number

[1327778-39-1]

Unit

25 mg

Molecular formula

C13H16N2O4

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USP-1A02290

Rivaroxaban phthalimido ethyl ester analog ((S)-1-(1,3-dioxoisoindolin-2-yl)-3-((ethoxycarbonyl)(4-(3-oxomorpholino)phenyl)amino)propan-2-yl 5-chlorothiophene-2-carboxylate)

Item no.

USP-1A02290

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C29H26ClN3O8S

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USP-1A02400

Diisobutyl Diazecinedione (4,9-Diisobutyl-1,6-diazecane-2,7-dione)

Item no.

USP-1A02400

CAS Number

[1990538-03-8]

Unit

25 mg

Molecular formula

C16H30N2O2

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USP-1A02420

Aripiprazole Diquinolinone Butanediol (7,7'-(butane-1,4-diylbis(oxy))bis(3,4-dihydroquinolin-2(1H)-one))

Item no.

USP-1A02420

CAS Number

[882880-12-8]

Unit

25 mg

Molecular formula

C22H24N2O4

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USP-1A02430

Chlorobutoxyquinolinone (7-(4-chlorobutoxy)-3,4-dihydroquinolin-2(1H)-one)

Item no.

USP-1A02430

CAS Number

[120004-79-7]

Unit

25 mg

Molecular formula

C13H16ClNO2

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USP-1A02450

2-Dechloro Aripiprazole (7-(4-(4-(3-chlorophenyl)piperazin-1-yl)butoxy)-3,4-dihydroquinolin-2(1H)-one)

Item no.

USP-1A02450

CAS Number

[203395-82-8]

Unit

25 mg

Molecular formula

C23H28ClN3O2

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USP-1A02530

Aripiprazole Isomer (5-(4-(4-(2,3-dichlorophenyl)piperazin-1-yl)butoxy)-3,4-dihydroquinolin-2(1H)-one)

Item no.

USP-1A02530

CAS Number

[203395-78-2]

Unit

25 mg

Molecular formula

C23H27Cl2N3O2

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USP-1A02570

3-Dechloro Aripiprazole (7-(4-(4-(2-chlorophenyl)piperazin-1-yl)butoxy)-3,4-dihydroquinolin-2(1H)-one)

Item no.

USP-1A02570

CAS Number

[203395-81-7]

Unit

25 mg

Molecular formula

C23H28ClN3O2

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USP-1A02580

N1-(2-Chloroethyl)-N2-(2,3-dichlorophenyl)ethane-1,2-diamine hydrochloride (N1-(2-chloroethyl)-N2-(2,3-dichlorophenyl)ethane-1,2-diamine, hydrochloride)

Item no.

USP-1A02580

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C10H13Cl3N2. HCl

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USP-1A02620

Sitagliptin (R)-Triazecine Analog ((R)-10-(2,4,5-trifluorobenzyl)-3-(trifluoromethyl)-6,7,10,11-tetrahydro-[1,2,4]triazolo[3,4-c][1,4,7]triazecine-8,12(5H,9H)-dione)

Item no.

USP-1A02620

CAS Number

[2088771-61-1]

Unit

25 mg

Molecular formula

C16H13F6N5O2

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USP-1A02780

2,4,5-Trimethylketoprofen (COLD SHIPMENT REQUIRED) ((2RS)-2-[3-(2,4,5-Trimethylbenzoyl)phenyl]propanoic Acid)

Item no.

USP-1A02780

CAS Number

[1797984-80-5]

Unit

25 mg

Molecular formula

C19H20O3

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USP-1A02820

2,5-Difluoro Sitagliptin ((3R)-3-Amino-4-(2,5-difluorophenyl)-1-[3-(trifluoromethyl)-5,6-dihydro[1,2,4]triazolo[4,3-a]pyrazin-7(8H)-yl]butan-1-one)

Item no.

USP-1A02820

CAS Number

[486460-31-5]

Unit

25 mg

Molecular formula

C16H16F5N5O

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USP-1A02890

Guanylmelamine Dinitrate (1-(4,6-diamino-1,3,5-triazin-2-yl)guanidine, nitrate)

Item no.

USP-1A02890

CAS Number

[27369-26-2]

Unit

25 mg

Molecular formula

C4H8N8. 2 HNO3

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USP-1A02920

1-Oxo Ivabradine Hydrochloride ((S)-3-(3-(((3,4-dimethoxybicyclo[4.2.0]octa-1(6),2,4-trien-7-yl)methyl)(methyl)amino)propyl)-7,8-dimethoxy-4,5-dihydro-1H-benzo[d]azepine-1,2(3H)-dione, hydrochloride)

Item no.

USP-1A02920

CAS Number

[1616710-50-9]

Unit

25 mg

Molecular formula

C27H34N2O6. HCl

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USP-1A02950

4-Desmethyl Ivabradine Hydrochloride ((S)-3-(3-(((4-hydroxy-3-methoxybicyclo[4.2.0]octa-1(6),2,4-trien-7-yl)methyl)(methyl)amino)propyl)-7,8-dimethoxy-1,3,4,5-tetrahydro-2H-benzo[d]azepin-2-one, hydrochloride)

Item no.

USP-1A02950

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C26H34N2O5. HCl

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USP-1A02990

Paroxetine Hydrochloride Piperidinemethanol Analog (((3S,4R)-4-(4-fluorophenyl)piperidin-3-yl)methanol, hydrochloride)

Item no.

USP-1A02990

CAS Number

[220548-73-2]

Unit

25 mg

Molecular formula

C12H16FNO. HCl

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USP-1A03000

Paroxetine Hydrochloride Catechol Analog (4-(((3S,4R)-4-(4-fluorophenyl)piperidin-3-yl)methoxy)benzene-1,2-diol, hydrochloride)

Item no.

USP-1A03000

CAS Number

[1394861-12-1]

Unit

25 mg

Molecular formula

C18H20FNO3. HCl

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USP-1A03040

Desfluoro (3S,4R)-Paroxol (((3S,4R)-1-methyl-4-phenylpiperidin-3-yl)methanol)

Item no.

USP-1A03040

CAS Number

[176022-03-0]

Unit

25 mg

Molecular formula

C13H19NO

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USP-1A03070

Piperazinedionecarbonyl D-phenylglycylglycine ((R)-(2-(4-ethyl-2,3-dioxopiperazine-1-carboxamido)-2-phenylacetyl) glycine)

Item no.

USP-1A03070

CAS Number

[2170771-47-6]

Unit

25 mg

Molecular formula

C17H20N4O6

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USP-1A03130

Ivabradine Open Ring ((S)-2-(2-(2-((3-(((3,4-dimethoxybicyclo[4.2.0]octa-1(6),2,4-trien-7-yl)methyl)(methyl)amino)propyl)amino)ethyl)-4,5-dimethoxyphenyl)acetic acid)

Item no.

USP-1A03130

CAS Number

[1462470-54-7]

Unit

25 mg

Molecular formula

C27H38N2O6

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USP-1A03140

Ivabradine Veratryl Analog Hydrochloride (3-(3-((2-(3,4-dimethoxyphenyl)propyl)(methyl)amino)propyl)-7,8-dimethoxy-1,3,4,5-tetrahydro-2H-benzo[d]azepin-2-one, hydrochloride)

Item no.

USP-1A03140

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C27H38N2O5. HCl

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USP-1A03260

Dibenzazepinodione (5H-dibenzo[b,f]azepine-10,11-dione)

Item no.

USP-1A03260

CAS Number

[19579-83-0]

Unit

50 mg

Molecular formula

C14H9NO2

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