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Pharmaceutical Reference Standards

USP - United States Pharmacopeia Pharmaceutical Analytical Impurities

1028 products found

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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-1A01610

Aminophenylmorpholin-2-one (4-(4-aminophenyl)morpholin-2-one)

Item no.

USP-1A01610

CAS Number

[1456733-00-8]

Unit

25 mg

Molecular formula

C10H12N2O2

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USP-1A01680

Tolterodine Propanol Analog (2-(3-Hydroxy-1-phenylpropyl)-4-methylphenol)

Item no.

USP-1A01680

CAS Number

[851789-43-0]

Unit

25 mg

Molecular formula

C16H18O2

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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-1A01780

Escitalopram Acid Analog (1-(3-(dimethylamino)propyl)-1-(4-fluorophenyl)-1,3-dihydroisobenzofuran-5-carboxylic acid)

Item no.

USP-1A01780

CAS Number

[440121-09-5]

Unit

25 mg

Molecular formula

C20H22FNO3

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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-1A01800

Lacosamide Acrylamide Analog (2-Acetamido-N-benzylacrylamide)

Item no.

USP-1A01800

CAS Number

[86921-49-5]

Unit

25 mg

Molecular formula

C12H14N2O2

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USP-1A01820

Ureidolacosamide ((R)-N-Benzyl-2-(3-benzylureido)-3-methoxypropanamide)

Item no.

USP-1A01820

CAS Number

[2295925-90-3]

Unit

25 mg

Molecular formula

C19H23N3O3

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USP-1A01930

Tacrolimus 5E-ene

Item no.

USP-1A01930

CAS Number

[104987-16-8]

Unit

25 mg

Molecular formula

C44H67NO11

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USP-1A01950

Dimethylacrylamide tolyl ketone ((2E)-N,N-dimethyl-4-(4-methylphenyl)-4-oxobut-2-enamide)

Item no.

USP-1A01950

Unit

25 mg

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USP-1A01960

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

Item no.

USP-1A01960

CAS Number

[103129-82-4]

Unit

25 mg

Molecular formula

C20H25ClN2O5

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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-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-1A02030

4'-Hydroxycelecoxib (4-(5-(4-(hydroxymethyl)phenyl)-3-(trifluoromethyl)-1H-pyrazol-1-yl)benzenesulfonamide)

Item no.

USP-1A02030

CAS Number

[170571-00-3]

Unit

25 mg

Molecular formula

C17H14F3N3O3S

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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-1A02050

Isotachysterol3 (COLD SHIPMENT REQUIRED) (S)-4-methyl-3-((E)-2-((1R,7aR)-7a-methyl-1-((R)-6-methylheptan-2-yl)-2,3,5,6,7,7a-hexahydro-1H-inden-4-yl)vinyl)cyclohex-3-en-1-ol)

Item no.

USP-1A02050

CAS Number

[22350-43-2]

Unit

25 mg

Molecular formula

C27H44O

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USP-1A02060

trans-Cholecalciferol (COLD SHIPMENT REQUIRED)

Item no.

USP-1A02060

CAS Number

[22350-41-0]

Unit

25 mg

Molecular formula

C27H44O

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USP-1A02070

7-Dehydrocholesterol (COLD SHIPMENT REQUIRED) ((3S,9S,10R,13R,14R,17R)-10,13-dimethyl-17-((R)-6-methylheptan-2-yl)-2,3,4,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol)

Item no.

USP-1A02070

CAS Number

[434-16-2]

Unit

25 mg

Molecular formula

C27H44O

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USP-1A02080

Clopidogrel Thienopyridinium Chloride (5-(1-(2-chlorophenyl)-2-methoxy-2-oxoethyl)thieno[3,2-c]pyridin-5-ium, chloride)

Item no.

USP-1A02080

Unit

25 mg

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USP-1A02100

Clopidogrel Acid N-Oxide (5-((S)-carboxy(2-chlorophenyl)methyl)-4,5,6,7-tetrahydrothieno[3,2-c]pyridine 5-oxide)

Item no.

USP-1A02100

CAS Number

[1319197-73-3]

Unit

25 mg

Molecular formula

C15H14ClNO3S

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USP-1A02110

rac-Clopidogrel Acid N-Oxide (5-(carboxy(2-chlorophenyl)methyl)-4,5,6,7-tetrahydrothieno[3,2-c]pyridine 5-oxide)

Item no.

USP-1A02110

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C15H14ClNO3S

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USP-1A02120

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

Item no.

USP-1A02120

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C24H21Cl2NO4S. H2SO4

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USP-1A02130

Desloratadine N-oxide (8-Chloro-6,11-dihydro-11-(4-piperidinylidene)-5H-benzo[5,6]cyclohepta[1,2-b]pyridine 1-Oxide)

Item no.

USP-1A02130

CAS Number

[169253-26-3]

Unit

25 mg

Molecular formula

C19H19ClN2O

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USP-1A02160

4-Hydroxy Duloxetine Acetate ((S)-4-(3-(methylamino)-1-(thiophen-2-yl)propoxy)naphthalen-1-ol, acetate)

Item no.

USP-1A02160

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C18H19NO2S. C2H4O2

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USP-1A02180

rac-Duloxetine-d7 Maleate (N-methyl-3-((naphthalen-1-yl-d7)oxy)-3-(thiophen-2-yl)propan-1-amine, maleate)

Item no.

USP-1A02180

Unit

25 mg

Molecular formula

C18H12D7NOS. C4H4O4

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USP-1A02200

Duloxetine Regioisomer (2-(2-(3-(methylamino)propyl)thiophen-3-yl)naphthalen-1-ol)

Item no.

USP-1A02200

CAS Number

[940291-11-2]

Unit

25 mg

Molecular formula

C18H19NOS

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USP-1A02230

Pemetrexed Tromethamide (N2-(4-(2-(2-amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl)benzoyl)-N5-(1,3-dihydroxy-2-(hydroxymethyl)propan-2-yl)-L-glutamine)

Item no.

USP-1A02230

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C24H30N6O

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USP-1A02240

Rivaroxaban Open Oxomorpholine Ring ((S)-5-chloro-N-((3-(4-(2-hydroxy-N-(2-hydroxyethyl)acetamido) phenyl)-2-oxooxazolidin-5-yl)methyl)thiophene-2-carboxamide)

Item no.

USP-1A02240

CAS Number

[1160170-00-2]

Unit

10 mg

Molecular formula

C19H20ClN3O6S

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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-1A02260

Dichlorothienoic Acid (4,5-dichlorothiophene-2-carboxylic acid)

Item no.

USP-1A02260

CAS Number

[31166-29-7]

Unit

25 mg

Molecular formula

C5H2Cl2O2S

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USP-1A02280

Rivaroxaban isomer (4-(4-(((2-(5-chlorothiophen-2-yl)-4,5-dihydrooxazol-5-yl)methyl)amino)phenyl)morpholin-3-one)

Item no.

USP-1A02280

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C18H18ClN3O3S

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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-1A02300

Rivaroxaban Ethylamino Analog (1-amino-3-((4-(3-oxomorpholino)phenyl)amino)propan-2-yl 5-chlorothiophene-2-carboxylate, hydrochloride)

Item no.

USP-1A02300

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C18H20ClN3O4S. 2 HCl

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USP-1A02310

N-Methyl rac-Lacosamide (2-acetamido-N-benzyl-3-methoxy-N-methylpropanamide)

Item no.

USP-1A02310

CAS Number

[388619-64-5]

Unit

25 mg

Molecular formula

C14H20N2O3

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USP-1A02330

rac-4,5-Dehydropregabalin (3-(aminomethyl)-5-methylhex-4-enoic acid)

Item no.

USP-1A02330

CAS Number

[216576-74-8]

Unit

25 mg

Molecular formula

C8H17NO2

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USP-1A02340

Lactosyl Pregabalin Pyrrolidone ((S)-1-((2R,3R,4R,5S,6R)-3,4-dihydroxy-6-(hydroxymethyl)-5-(((2S,3R,4S,5R,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)tetrahydro-2H-pyran-2-yl)oxy)tetrahydro-2H-pyran-2-yl)-4-isobutylpyrrolidin-2-one)

Item no.

USP-1A02340

CAS Number

[466678-44-4]

Unit

25 mg

Molecular formula

C20H35NO11

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USP-1A02350

rac-5,6-Dehydropregabalin (3-(aminomethyl)-5-methylhex-5-enoic acid)

Item no.

USP-1A02350

CAS Number

[1136478-30-2]

Unit

25 mg

Molecular formula

C8H15NO2

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USP-1A02360

Pemetrexed Sodium 1-Methyl Ester ((S)-4-(4-(2-(2-amino-4-oxo-4,7-dihydro-3H-pyrrolo[2,3-d]pyrimidin-5-yl)ethyl)benzamido)-5-methoxy-5-oxopentanoic acid, sodium salt)

Item no.

USP-1A02360

CAS Number

[1265908-61-9]

Unit

25 mg

Molecular formula

C21H22N5O6. Na

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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-1A02440

2-Monobromo Aripiprazole Hydrochloride (7-(4-(4-(2-bromophenyl)piperazin-1-yl)butoxy)-3,4-dihydroquinolin-2(1H)-one, hydrochloride)

Item no.

USP-1A02440

CAS Number

[n/a]

Unit

25 mg

Molecular formula

C23H28BrN3O2. HCl

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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-1A02470

Aripiprazole Acid Analog (4-((2-oxo-1,2,3,4-tetrahydroquinolin-7-yl)oxy)butanoic acid)

Item no.

USP-1A02470

CAS Number

[58899-27-7]

Unit

25 mg

Molecular formula

C13H15NO4

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USP-1A02480

Aripiprazole Bromobutoxyquinolinone Analog (7-(4-bromobutoxy)quinolin-2(1H)-one)

Item no.

USP-1A02480

CAS Number

[203395-59-9]

Unit

25 mg

Molecular formula

C13H14BrNO2

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USP-1A02490

5-(4-Bromobutoxy)-3,4-dihydroquinolin-2(1H)-one (5-(4-bromobutoxy)-3,4-dihydroquinolin-2(1H)-one)

Item no.

USP-1A02490

CAS Number

[63309-35-3]

Unit

25 mg

Molecular formula

C13H16BrNO2

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USP-1A02500

N-Alkyl Aripiprazole (7-(4-(4-(2,3-dichlorophenyl)piperazin-1-yl)butoxy)-1-(4-((2-oxo-1,2,3,4-tetrahydroquinolin-7-yl)oxy)butyl)-3,4-dihydroquinolin-2(1H)-one)

Item no.

USP-1A02500

CAS Number

[1424857-63-5]

Unit

25 mg

Molecular formula

C36H42Cl2N4O4

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USP-1A02510

8-Hydroxy-3,4-dihydroquinolin-2(1H)-one (3,4-dihydro-8-hydroxy-2(1H)-Quinolinone)

Item no.

USP-1A02510

CAS Number

[52749-50-5]

Unit

25 mg

Molecular formula

C9H9NO2

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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-1A02560

Aripiprazole Hydroxyquinolinone Analog (7-hydroxyquinolin-2(1H)-one)

Item no.

USP-1A02560

CAS Number

[70500-72-0]

Unit

25 mg

Molecular formula

C9H7NO2

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