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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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Dapoxetine, Impurities

(R)-N-Demethyl Dapoxetine

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CAS No.

: 1202160-36-8

Mol F.

: C20H21NO

Mol W.

: 291.39

Cat No.

: SA23007

Ibrutinib, Impurities

(R)-N-Desacryloyl N-Formyl Ibrutinib | CAS : 1628179-43-0

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CAS No.

: 1628179-43-0

Mol F.

: C23H22N6O2

Mol W.

: 414.5

Cat No.

: SA47424

Dapoxetine, Impurities

(R)-N-Didemethyl Dapoxetine

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CAS No.

: 1329834-62-9

Mol F.

: C19H19NO

Mol W.

: 277.36

Cat No.

: SA23010

Impurities, Tolterodine

(R)-Tolterodine Propionic Acid Impurity

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CAS No.

: NA

Mol F.

: C16H16O3

Mol W.

: 256.3

Cat No.

: SA28216

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

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, Zolmitriptan

(S)-4-(4-Aminobenzyl)-2-(1H)-oxazolidinone

$100.00 100 mg

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CAS No.

: 152305-23-2

Mol F.

: C10H12N2O2

Mol W.

: 192.21

Cat No.

: SA11907

Impurities, Nicotine

(S)-6-Chloronicotine

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CAS No.

: 112091-17-5

Mol F.

: C₁₀H₁₃ClN₂

Mol W.

: 196.68

Cat No.

: SA32210

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

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

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

Impurities, 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, Pregabalin

(S)-Pregabalin

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CAS No.

: 148553-50-8

Mol F.

: C8H17NO2

Mol W.

: 159.22999999999999

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 Lactam

$125.00 25 mg

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CAS No.

: 181289-23-6

Mol F.

: C8H15NO

Mol W.

: 141.21

Cat No.

: SA24820

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

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

Impurities, Tapinarof

(Z)-Dimethoxy Tapinarof

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CAS No.

: 1622988-16-2

Mol F.

: C19H22O2

Mol W.

: 282.38

Cat No.

: SA51603

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

Impurities, Norethindrone

∆-5(6)-Norethindrone Acetate; Norethindrone Acetate EP Impurity C

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CAS No.

: 1175129-26-6

Mol F.

: C22H28O3

Mol W.

: 340.46

Cat No.

: SA13406

Impurities, Norethindrone

∆-5(6)-Norethindrone; Norethisterone Impurity C (EP)

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CAS No.

: 22933-71-7

Mol F.

: C20H26O2

Mol W.

: 298.42

Cat No.

: SA13407

Impurities, Testosterone

∆8(14)-Testosterone

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CAS No.

Mol F.

: C19H26O2

Mol W.

: 286.41

Cat No.

: SA16226

Impurities, Ritlecitinib

1-((2S,5R)-5-(7H-pyrrolo[2,3-d]pyrimidin-4-ylamino)-2-methylpiperidin-1-yl)-3-chloropropan-1-one

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CAS No.

Mol F.

: C15H20ClN5O

Mol W.

: 321.81

Cat No.

: SA50006

Hydrocortisone, Impurities

1-((8S,9S,10R,11S,13S,14S,17R)-11,17-dihydroxy-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)-2,3-dihydroxy-4-((8S,9S,10R,11S,13S,14S,17S)-11-hydroxy-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl)butane-1,4-dione

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CAS No.

Mol F.

: C42H58O9

Mol W.

: 706.92

Cat No.

: SA15231

Impurities, Timolol

1-(2-(tert-Butylamino)-2-hydroxyethyl)-4-morpholino-1H-imidazol-5(2H)-one

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CAS No.

: 158636-97-6

Mol F.

: C13H24N4O3

Mol W.

: 284.35

Cat No.

: SA23221

Impurities, Tulobuterol

1-(2-Chlorophenyl)-2-Bromoethanol

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CAS No.

: 72702-57-9

Mol F.

: C8H8BrClO

Mol W.

: 235.5

Cat No.

: SA19603