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Pharmaceutical Reference Standards

USP - United States Pharmacopeia Pharmaceutical Analytical Impurities

976 products found

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USP-1A00220

Desoximetasone Acid (COLD SHIPMENT) ((11Beta,16alpha,17Beta)-9-Fluoro-11-hydroxy-16-methyl-3-oxoandrosta-1,4- diene-17-carboxylic acid, 9-Fluoro-11Beta-hydroxy-16alpha-methyl-3-oxoandrosta-1,4-diene-17Beta-carboxylic acid)

Item no.

USP-1A00220

CAS Number

[75262-69-0]

Unit

25 mg

Molecular formula

C21H27FO4

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USP-1A00290

Isopropyl 4-acetylbenzoate (COLD SHIPMENT REQUIRED) (Isopropyl 4-acetylbenzoate)

Item no.

USP-1A00290

CAS Number

[220089-22-5]

Unit

25 mg

Molecular formula

C12H14O3

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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-1A00340

Dexamethasone Ethyl Ester (COLD SHIPMENT REQUIRED) (Ethyl 11Beta,17alpha-dihydroxy-9-fluoro-16alpha-methylandrostane-1,4-diene-3-one-17-ylcarboxylate)

Item no.

USP-1A00340

CAS Number

[37926-77-5]

Unit

25 mg

Molecular formula

C23H31FO5

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USP-1A00360

Ethylpyrazinediethanol (2,2'-(3-ethylpyrazine-2,5-diyl)bis(ethan-1-ol))

Item no.

USP-1A00360

CAS Number

[86917-74-0]

Unit

10 mg

Molecular formula

C10H16N2O2

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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-1A00380

Pyrazinediethanol Propionic Acid (3-(3,6-bis(2-hydroxyethyl)pyrazin-2-yl)propanoate, sodium salt)

Item no.

USP-1A00380

CAS Number

[96681-85-5] (free acid)

Unit

5 mg

Molecular formula

C11H15NaN2O4

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USP-1A00390

Nebramine ((1S,2R,3R,4S,6R)-4,6-diamino-3-(((2R,3R,5S,6R)-3-amino-6-(aminomethyl)-5-hydroxytetrahydro-2H-pyran-2-yl)oxy)cyclohexane-1,2-diol)

Item no.

USP-1A00390

CAS Number

[34051-04-2]

Unit

10 mg

Molecular formula

C12H26N4O5

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USP-1A00400

Tetramethyl Ethylene Diamine (N1,N1,N2,N2-tetramethylethane-1,2-diamine)

Item no.

USP-1A00400

CAS Number

[110-18-9]

Unit

25 mg

Molecular formula

C6H16N2

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USP-1A00420

Clopidogrel Diester Analog (R)-1-(2-chlorophenyl)-2-methoxy-2-oxoethyl (S)-2-(2-chlorophenyl)-2-(6,7-dihydrothieno[3,2-c]pyridin-5(4H)-yl)acetate, sulfate

Item no.

USP-1A00420

CAS Number

[1421283-60-4] (free base)

Unit

10 mg

Molecular formula

C24H21Cl2NO4S·H2SO4

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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-1A00440

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

Item no.

USP-1A00440

CAS Number

[1868118-63-1]

Unit

10 mg

Molecular formula

C8H16N2O3

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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-1A00460

Pyrrolic acid Derivative (4-(2-hydroxyethyl)-1H-pyrrole-3-carboxylic acid)

Item no.

USP-1A00460

CAS Number

[404839-11-8]

Unit

10 mg

Molecular formula

C7H9NO3

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USP-1A00470

17-Oxo Dexamethasone ((8S,9R,10S,11S,13S,14S,16R)-9-fluoro-11-hydroxy-10,13,16-trimethyl-7,8,9,10,11,12,13,14,15,16-decahydro-3H-cyclopenta[a]phenanthrene-3,17(6H)-dione)

Item no.

USP-1A00470

CAS Number

[1880-61-1]

Unit

10 mg

Molecular formula

C20H25FO3

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USP-1A00480

Ibuprofen Tetraethylene Glycol Diester (((oxybis(ethane-2,1-diyl))bis(oxy))bis(ethane-2,1-diyl) bis(2-(4-isobutylphenyl)propanoate)))

Item no.

USP-1A00480

CAS Number

[1161014-75-0]

Unit

25 mg

Molecular formula

C34H50O7

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USP-1A00490

Amoxicilloic Acid Dimers 1 and 2

Item no.

USP-1A00490

CAS Number

[2088961-38-8]

Unit

10 mg

Molecular formula

C32H40N6O11S2

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USP-1A00500

Budesonide D-homo Analog ((4aR,4bS,5S,6aS,7aR,10aR,11aS,11bS)-5-hydroxy-7a-(hydroxymethyl)-4a,6a-dimethyl-9-propyl-4b,6,6a,7a,10a,11,11a,11b,12,13-decahydrochryseno[2,3-d][1,3]dioxole-2,7(4aH,5H)-dione)

Item no.

USP-1A00500

CAS Number

[1040085-99-1]

Unit

10 mg

Molecular formula

C25H34O6

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USP-1A00510

Budesonide Acetaldehyde Acetal (16alpha,17-[(1RS)-ethylidenebis(oxy)]-11beta,21-dihydroxypregna-1,4-diene-3,20-dione)

Item no.

USP-1A00510

CAS Number

[1040085-98-0]

Unit

25 mg

Molecular formula

C23H30O6

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USP-1A00520

5-Fluoro Risperidone (3-(2-(4-(5-fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one)

Item no.

USP-1A00520

CAS Number

[1199589-74-6]

Unit

25 mg

Molecular formula

C23H27FN4O2

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USP-1A00530

N6-(1-Iminoethyl)-D-lysine ((2R)-2-[(2S)-2-Aminobutanamido]butanamide)

Item no.

USP-1A00530

CAS Number

[1844123-52-9]

Unit

10 mg

Molecular formula

C8H17N3O2

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USP-1A00540

Bis((R)-butyramide) ((R)-2-amino-N-((R)-1-amino-1-oxobutan-2-yl)butanamide)

Item no.

USP-1A00540

CAS Number

[1867585-44-1]

Unit

10 mg

Molecular formula

C8H17N3O2

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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-1A00560

2-Oxo Clopidogrel (Mixture of Diastereomers) (methyl 2-(2-chlorophenyl)-2-(2-oxo-2,6,7,7a-tetrahydrothieno[3,2-c]pyridin-5(4H)-yl)acetate)

Item no.

USP-1A00560

CAS Number

[109904-27-0]

Unit

10 mg

Molecular formula

C16H16ClNO3S

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USP-1A00570

2-Oxo R-Clopidogrel (methyl (2R)-2-(2-chlorophenyl)-2-(2-oxo-2,6,7,7a-tetrahydrothieno[3,2-c]pyridin-5(4H)-yl)acetate)

Item no.

USP-1A00570

CAS Number

[1360923-54-1]

Unit

10 mg

Molecular formula

C16H16ClNO3S

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USP-1A00580

4-Fluoro Risperidone (COLD SHIPMENT REQUIRED) (3-(2-(4-(4-fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one)

Item no.

USP-1A00580

CAS Number

[n/a]

Unit

10 mg

Molecular formula

C23H27FN4O2

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USP-1A00590

7-Fluoro Risperidone (COLD SHIPMENT REQUIRED) (3-(2-(4-(7-fluorobenzo[d]isoxazol-3-yl)piperidin-1-yl)ethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one)

Item no.

USP-1A00590

CAS Number

[n/a]

Unit

10 mg

Molecular formula

C23H27FN4O2

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USP-1A00600

Risperidone Difluoroketone (3-(2-(4-(2,4-difluorobenzoyl)piperidin-1-yl)ethyl)-2-methyl-6,7,8,9-tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one)

Item no.

USP-1A00600

CAS Number

[158697-67-7]

Unit

10 mg

Molecular formula

C23H27F2N3O2

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USP-1A00610

Pemetrexed Glutamide Trisodium Salt (((S)-4-(4-(2-(2-amino-4-oxo-4,7-dihydro-1H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl)benzamido)-4-carboxybutanoyl)-L-glutamic acid, sodium salt)

Item no.

USP-1A00610

CAS Number

[1265908-59-5]

Unit

25 mg

Molecular formula

C25H25N6O9·3Na

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USP-1A00620

Pemetrexed Disodium Enantiomer ((2R)-2-[[4-[2-(2-amino-4-oxo-4,7-dihydro-1H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoyl]amino]pentanedioic acid, sodium salt)

Item no.

USP-1A00620

CAS Number

[937370-10-0]

Unit

25 mg

Molecular formula

C20H19N5O6·2Na

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USP-1A00630

Pemetrexed Acid N-Hydroxysuccinimide Ester (2,5-dioxopyrrolidin-1-yl 4-(2-(2-amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl)benzoate)

Item no.

USP-1A00630

CAS Number

[204257-65-8]

Unit

25 mg

Molecular formula

C19H17N5O5

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USP-1A00660

Rivaroxaban Phthalamide (N1,N2-bis(((S)-2-oxo-3-(4-(3-oxomorpholino)phenyl)oxazolidin-5-yl)methyl)phthalamide)

Item no.

USP-1A00660

CAS Number

[1365267-36-2]

Unit

25 mg

Molecular formula

C36H36N6O10

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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-1A00720

Desiodoamiodarone ((2-butylbenzofuran-3-yl)(4-(2-(diethylamino)ethoxy)phenyl)methanone)

Item no.

USP-1A00720

CAS Number

[23551-25-9]

Unit

25 mg

Molecular formula

C25H31NO3

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USP-1A00750

Tolyloyl Bromopropionamide (3-bromo-N,N-dimethyl-4-oxo-4-(p-tolyl)butanamide)

Item no.

USP-1A00750

CAS Number

[836627-56-6]

Unit

25 mg

Molecular formula

C13H16BrNO2

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USP-1A00810

Atorvastatin Sodium Pyrrolidone Analog ((3R,5R)-5-(4-Fluorophenyl)-2,3-dihydro-3,5-dihydroxy-3-(1-methylethyl)-2-oxo-4-phenyl-3-[(phenylamino)carbonyl]-1H-pyrrole-1-heptanoic Acid Sodium Salt)

Item no.

USP-1A00810

CAS Number

[148217-40-7]

Unit

25 mg

Molecular formula

C33H34FN2NaO6

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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-1A00880

16alpha-Hydroxyprednisolone ((8S,9S,10R,11S,13S,14S,16R,17S)-11,16,17-trihydroxy-17-(2-hydroxyacetyl)-10,13-dimethyl-6,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-3H-cyclopenta[a]phenanthren-3-one)

Item no.

USP-1A00880

CAS Number

[13951-70-7]

Unit

25 mg

Molecular formula

C21H28O6

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USP-1A00900

4-Methylacetophenone (1-(4-Methylphenyl)-1-ethanone (4'-Methylacetophenone))

Item no.

USP-1A00900

CAS Number

[122-00-9]

Unit

25 mg

Molecular formula

C9H10O

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USP-1A00920

Desaryl Celecoxib (5-(p-tolyl)-3-(trifluoromethyl)-1H-pyrazole)

Item no.

USP-1A00920

CAS Number

[948293-46-7]

Unit

25 mg

Molecular formula

C11H9F3N2

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USP-1A00940

Duloxetine 4-Naphthyl Isomer Hydrobromide (4-(3-(methylamino)-1-(thiophen-2-yl)propyl)naphthalen-1-ol, hydrobromide)

Item no.

USP-1A00940

CAS Number

[949096-01-9]

Unit

25 mg

Molecular formula

C18H19NOS·HBr

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USP-1A00960

Duloxetine Alcohol ((R)-3-(methylamino)-1-(thiophen-2-yl)propan-1-ol)

Item no.

USP-1A00960

CAS Number

[116539-57-2]

Unit

25 mg

Molecular formula

C8H13NOS

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USP-1A00970

N-Methyl Duloxetine Oxalate ((S)-N,N-dimethyl-3-(naphthalen-1-yloxy)-3-(thiophen-2-yl)propan-1-amine, oxalate)

Item no.

USP-1A00970

CAS Number

[132335-47-8]

Unit

25 mg

Molecular formula

C19H21NOS·C2H2O4 (C21H23NO5S)

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USP-1A01000

Floxacin Amine (7-amino-1-cyclopropyl-6-fluoro-8-methoxy-4-oxo-1,4-dihydroquinoline-3-carboxylic acid)

Item no.

USP-1A01000

CAS Number

[172426-88-9]

Unit

25 mg

Molecular formula

C14H13FN2O4

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USP-1A01110

Dehydro Desloratadine (8-chloro-11-(piperidin-4-ylidene)-11H-benzo[5,6]cyclohepta[1,2-b]pyridine)

Item no.

USP-1A01110

CAS Number

[117811-20-8]

Unit

25 mg

Molecular formula

C19H17ClN2

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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-1A01140

Pemetrexed Acid (4-(2-(2-amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl)benzoic acid)

Item no.

USP-1A01140

CAS Number

[137281-39-1]

Unit

25 mg

Molecular formula

C15H14N4O3

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USP-1A01180

Chlorothiophene carboxylic acid (5-chlorothiophene-2-carboxylic acid)

Item no.

USP-1A01180

CAS Number

[24065-33-6]

Unit

25 mg

Molecular formula

C5H3ClO2S

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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-1A01220

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

Item no.

USP-1A01220

CAS Number

[131918-72-4]

Unit

25 mg

Molecular formula

C23H28O7

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