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Impurities

SynThink is a trusted producer and supplier of Pharmaceutical Reference Standards, including Impurity Standards. These materials are essential for pharmaceutical companies conducting research into the quality, stability, and biological safety of drug products. We maintain a robust inventory of API impurities, ready to support your development and regulatory needs.

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Bupropion, Impurities

(S,S)-Hydroxy Bupropion

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CAS No.

: 192374-14-4

Mol F.

: C₁₃H₁₈ClNO₂

Mol W.

: 255.74

Cat No.

: SA12227

Labetalol

(S,S)-Labetalol

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CAS No.

: 83167-24-2

Mol F.

: C19H24N2O3

Mol W.

: 328.4

Cat No.

: SA69114

Impurities, Palonosetron

(S,S)-Palonosetron Acid

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CAS No.

: 2407763-21-5

Mol F.

: C19H26N2O2

Mol W.

: 314.4

Cat No.

: SA73619

Dropropizine

(S)-(-)-Dropropizine N,N-Dioxide

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CAS No.

: 2098198-51-5

Mol F.

: C13H20N2O4

Mol W.

: 268.3

Cat No.

: SA64605

Bupropion, Impurities

(S)-1-(3-Chlorophenyl)-2-hydroxy-1-propanone

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CAS No.

: 287477-53-6

Mol F.

: C9H9ClO2

Mol W.

: 184.62

Cat No.

: SA12213

Carbamazepine, Impurities

(S)-10-Monohydroxy-10,11-dihydro Carbamazepine

$95.00 25 mg

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CAS No.

: 104746-04-5

Mol F.

: C15H14N2O2

Mol W.

: 254.28

Cat No.

: SA20330

Argatroban, Impurities

(S)-2-((R)-1-(3,5-bis(Trifluoromethyl)phenyl)ethoxy)-4-benzylmorpholin-3-one

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CAS No.

: 327623-36-9

Mol F.

: C21H19F6NO3

Mol W.

: 447.37

Cat No.

: SA48414

Brivaracetam, Impurities

(S)-2-((R)-4-((S)-2-Hydroxypropyl)-2-oxopyrrolidin-1-yl)butanamide

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CAS No.

: 357336-94-8

Mol F.

: C11H20N2O3

Mol W.

: 228.3

Cat No.

: SA47307

Impurities, Nirmatrelvir

(S)-2-Amino-3-((S)-2-oxopyrrolidin-3-yl)propanenitrile hydrochloride

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CAS No.

: 2755950-35-5

Mol F.

: C7H12ClN3O

Mol W.

: 189.64

Cat No.

: SA46906

Impurities, Nirmatrelvir

(S)-2-Amino-3-((S)-2-oxopyrrolidin-3-yl)propanoic acid

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CAS No.

: NA

Mol F.

: C7H12N2O3

Mol W.

: 172.2

Cat No.

: SA46912

Impurities, Sapropterin

(S)-2-amino-6-(1-hydroxyethyl)pteridin-4(3H)-one

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CAS No.

: NA

Mol F.

: C8H9N5O2

Mol W.

: 207.19

Cat No.

: SA45214

Impurities, Remdesivir

(S)-2-ethylbutyl 2-((S)-(((2R,3S,4R,5S)-5-(4-aminopyrrolo[1,2-f][1,2,4]triazin-7-yl)-5-carbamoyl-3,4-dihydroxytetrahydrofuran-2-yl)methoxy)

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CAS No.

: NA

Mol F.

: C27H37N6O9P

Mol W.

: 620.24

Cat No.

: SA42734

Apixaban, Impurities

(S)-2-Ethylbutyl 2-aminopropanoate HCl

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CAS No.

: 946511-97-3 (HCl)

Mol F.

: C9H20ClNO2 (HCl)

Mol W.

: 209.71

Cat No.

: SA42736

Impurities, Pregabalin

(S)-3-(Aminomethyl)-N,N-diethyl-5-methylhexanamide (2S,3S)-2,3-dihydroxysuccinate

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CAS No.

: 1094517-98-2

Mol F.

: C16H32N2O7

Mol W.

: 364.43

Cat No.

: SA24843

Atomoxetine, Impurities

(S)-3-Chloro-1-phenyl-1-[2-methyl-phenoxyl]propane

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CAS No.

: 114446-50-3

Mol F.

: C16H17ClO

Mol W.

: 260.76

Cat No.

: SA22121

Impurities, Nicotine

(S)-6-Chloronicotine

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CAS No.

: 112091-17-5

Mol F.

: C₁₀H₁₃ClN₂

Mol W.

: 196.68

Cat No.

: SA32210

Alogliptin, Impurities

(S)-Alogliptin Benzoate Salt

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CAS No.

: 1638544-64-5

Mol F.

: C18H21N5O2 : C7H6O2

Mol W.

: 339.4 : 122.1

Cat No.

: SA54101

Azelastine, Impurities

(S)-Azelastine HCl

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CAS No.

: 153408-27-6

Mol F.

: C22H24ClN3O : HCl

Mol W.

: 381.9 : 36.5

Cat No.

: SA54702

Baclofen, Impurities

(S)-Baclofen

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CAS No.

: 66514-99-6

Mol F.

: C10H12ClNO2

Mol W.

: 213.66

Cat No.

: SA28110

Brinzolamide, Impurities

(S)-Brinzolamide; Brinzolamide USP Related Compound A

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CAS No.

: 154127-19-2

Mol F.

: C12H21N3O5S3

Mol W.

: 383.51

Cat No.

: SA47201

Bupropion, Impurities

(S)-Bupropion L-Tartaric Acid Salt

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CAS No.

: 324548-43-8 (freebase)

Mol F.

: C17H24ClNO7

Mol W.

: 389.83

Cat No.

: SA12207

Elexacaftor

(S)-Elexacaftor Nicotinic Acid Impurity

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CAS No.

: 2229861-71-4

Mol F.

: C21H27F3N4O3

Mol W.

: 440.5

Cat No.

: SA64107

Etodolac

(S)-Etodolac

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CAS No.

: 87249-11-4

Mol F.

: 287.4

Mol W.

: C17H21NO3

Cat No.

: SA62202

Frovatriptan, Impurities

(S)-Frovatriptan

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CAS No.

: 158930-18-8

Mol F.

: C14H17N3O

Mol W.

: 243.3

Cat No.

: SA34602

Impurities, Isoproterenol

(S)-Isoprenaline; (S)-Isoproterenol

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CAS No.

: 2964-04-7

Mol F.

: C11H17NO3

Mol W.

: 211.26

Cat No.

: SA25905

Impurities, Timolol

(S)-Isotimolol

$800.00 25 mg

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CAS No.

: 158636-96-5

Mol F.

: C13H24NO3S

Mol W.

: 316.42

Cat No.

: SA23216

Impurities, Lercanidipine

(S)-Lercanidipine HCl

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CAS No.

: 184866-29-3

Mol F.

: C36H42ClN3O6

Mol W.

: 648.19

Cat No.

: SA50912

Impurities, Lorcaserin

(S)-Lorcaserin

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CAS No.

: 616202-81-4; 1006037-59-79 (HCl)

Mol F.

: C11H14ClN

Mol W.

: 195.69

Cat No.

: SA18809

Mirtazapine

(S)-Mirtazapine

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CAS No.

: 61337-87-9

Mol F.

: C17H19N3

Mol W.

: 265.4

Cat No.

: SA72302

Cinacalcet, Impurities

(S)-N-((R)-1-(naphthalen-1-yl)ethyl)-2-(3-(trifluoromethyl)phenyl)propan-1-amine

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CAS No.

: 2059891-96-0

Mol F.

: C22H22F3N

Mol W.

: 357.41

Cat No.

: SA34216

Dapoxetine, Impurities

(S)-N-Demethyl Dapoxetine

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CAS No.

: 147199-39-1

Mol F.

: SA23008

Mol W.

: 291.39

Cat No.

: SA23008

Dapoxetine, Impurities

(S)-N-Didemethyl Dapoxetine

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CAS No.

: 147199-40-4

Mol F.

: C19H19NO

Mol W.

: 277.36

Cat No.

: SA23009

Impurities, Pregabalin

(S)-N-Methyl Pregabalin

$395.00 25 mg

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CAS No.

: 1155843-61-0

Mol F.

: C9H19NO2

Mol W.

: 173.25

Cat No.

: SA24815

Pregabalin

(S)-N-tert-Butoxycarbonyl Pregabalin Methyl Ester

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CAS No.

: 1246816-46-5

Mol F.

: C14H27NO4

Mol W.

: 273.37

Cat No.

: SA24810

Impurities, Olodaterol

(S)-Olodaterol

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CAS No.

: 868049-50-7

Mol F.

: C21H26N2O5

Mol W.

: 386.4

Cat No.

: SA19901

Impurities, Pregabalin

(S)-Pregabalin

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CAS No.

: 148553-50-8

Mol F.

: C8H17NO2

Mol W.

: 159.22

Cat No.

: SA24803

Impurities, Pregabalin

(S)-Pregabalin (N-Methyl)-lactam

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CAS No.

: NA

Mol F.

: C9H17NO

Mol W.

: 155.24

Cat No.

: SA24821

Impurities, Pregabalin

(S)-Pregabalin Methyl Ester

$155.00 25 mg

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CAS No.

: 714230-22-5

Mol F.

: C9H20ClNO2

Mol W.

: 209.71

Cat No.

: SA24818

Impurities, Viloxazine

(S)-Viloxazine Hydrochloride

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CAS No.

: 56287-61-7

Mol F.

: C13H19NO3 : HCl

Mol W.

: 237.3 : 36.5

Cat No.

: SA23502

Eltrombopag, Impurities

(Z)-2′-hydroxy-3′-(2-(3-methyl-5-oxo-1-p-tolyl-1H-pyrazol-4(5H)-ylidene)hydrazinyl)biphenyl-3-carboxylic acid

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CAS No.

Mol F.

: C24H20N4O4

Mol W.

: 428.44

Cat No.

: SA51111

Eltrombopag, Impurities

(Z)-2′-hydroxy-3′-(2-(5-oxo-1-phenyl-1H-pyrazol-4(5H)-ylidene)hydrazinyl)biphenyl-3-carboxylic acid

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CAS No.

Mol F.

: C22H16N4O4

Mol W.

: 400.39

Cat No.

: SA51110

Eltrombopag, Impurities

(Z)-3,4,5-trihydroxy-6-(2′-hydroxy-3′-(1-hydroxy-2-(5-oxo-1H-pyrazol-4(5H)-ylidene)hydrazinyl)biphenylcarbonyloxy)tetrahydro-2H-pyran-2-carboxylic acid

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CAS No.

Mol F.

: C22H20N4O11

Mol W.

: 516.41

Cat No.

: SA51115

Eltrombopag, Impurities

(Z)-4-((Z)-(6-hydroxy-5-phenylcyclohexa-2,4-dienylidene)hydrazono)-1-phenyl-1H-pyrazol-5(4H)-one

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CAS No.

Mol F.

: C21H16N4O2

Mol W.

: 356.38

Cat No.

: SA51114

Tenofovir

(Z)-9-Propenyladenine

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CAS No.

: 1464851-21-5

Mol F.

: C8H9N5

Mol W.

: 175.2

Cat No.

: SA36942

Impurities, Tapinarof

(Z)-Dimethoxy Tapinarof

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CAS No.

: 1622988-16-2

Mol F.

: C19H22O2

Mol W.

: 282.38

Cat No.

: SA51603

Meloxicam

(Z)-N’-Methyl Meloxicam

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CAS No.

: 1145656-36-5

Mol F.

: C15H15N3O4S2

Mol W.

: 365.4

Cat No.

: SA71510

Impurities, Losartan

[1,1’-Biphenyl]-2’-tetrazolo-4-carboxylic acid, [1,1’-biphenyl]-2’-tetrazolo-4-ylmethyl ester

$395.00 25 mg

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CAS No.

: 1159977-10-2

Mol F.

: C28H20N8O2

Mol W.

: 500.51

Cat No.

: SA26723

Empagliflozin, Impurities

[2-chloro-5-(tetrahydrofuran-3-yloxy)phenyl][4-(tetrahydrofuran-3-yloxy)phenyl]methanone

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CAS No.

Mol F.

: C21H21ClO5

Mol W.

: 388.84

Cat No.

: SA15148

Impurities, Testosterone

∆ 8(9) Testosterone Cypionate

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CAS No.

Mol F.

: C27H38O3

Mol W.

: 410.6

Cat No.

: SA16223

Impurities, Testosterone

∆ 9(11) Testosterone Cypionate

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CAS No.

: 122651-11-0

Mol F.

: C27H38O3

Mol W.

: 410.6

Cat No.

: SA16222