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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Canagliflozin, Impurities

(R)-Cangliflozin Furanose impurity

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Out of Stock

CAS No.

Mol F.

: C24H25FO5S

Mol W.

: 444.53

Cat No.

: SA14903

Cetirizine, Impurities

(R)-De(carboxymethyl) Cetirizine Ethanol Dihydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 728948-88-7

Mol F.

: C19H25Cl3N2O

Mol W.

: 403.77

Cat No.

: SA13502

Efavirenz, Impurities

(R)-Efavirenz Benzoyl Amino Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 353270-77-6

Mol F.

: C21H17ClF3NO3

Mol W.

: 423.81

Cat No.

: SA17603

Brivaracetam, Impurities

(R)-Ethyl-3-(bromomethyl)hexanoate

$395.00 25 mg

Out of Stock

CAS No.

: 1956435-91-8

Mol F.

: C9H17BrO2

Mol W.

: 237.13

Cat No.

: SA47305

Impurities, Isoproterenol

(R)-Isoprenaline; (R)-Isoproterenol

Please enquire for price & pack size

Out of Stock

CAS No.

: 51-31-0(Base);54750-10-6(BitartrateSalt)

Mol F.

: C11H17NO3

Mol W.

: 211.26

Cat No.

: SA25904

Impurities, Lercanidipine

(R)-Lercanidipine HCl

Please enquire for price & pack size

Out of Stock

CAS No.

: 187731-34-6

Mol F.

: C36H42ClN3O6

Mol W.

: 648.19

Cat No.

: SA50911

Carbamazepine, Impurities

(R)-Licarbazepine Acetate

$295.00 25 mg

Out of Stock

CAS No.

: 186694-45-1

Mol F.

: C16H16N2O3

Mol W.

: 296.32

Cat No.

: SA20329

Impurities, Linezolid

(R)-Linezolid

Please enquire for price & pack size

Out of Stock

CAS No.

: 872992-20-6

Mol F.

: C₁₆H₂₀FN₃O₄

Mol W.

: 337.35

Cat No.

: SA17506

Cinacalcet, Impurities

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 2059891-97-1

Mol F.

: C22H22F3N

Mol W.

: 357.4

Cat No.

: SA34217

Argatroban, Impurities

(R)-N-((S)-2-Imino-4-oxo-1,3-diazepan-5-yl)-3-methyl-1,2,3,4-tetrahydroquinoline-8-sulfonamide

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C15H21N5O3S

Mol W.

: 351.42

Cat No.

: SA48419

Dapoxetine, Impurities

(R)-N-Demethyl Dapoxetine

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 1628179-43-0

Mol F.

: C23H22N6O2

Mol W.

: 414.5

Cat No.

: SA47424

Dapoxetine, Impurities

(R)-N-Didemethyl Dapoxetine

Please enquire for price & pack size

Out of Stock

CAS No.

: 1329834-62-9

Mol F.

: C19H19NO

Mol W.

: 277.36

Cat No.

: SA23010

Impurities, Tolterodine

(R)-Tolterodine Propionic Acid Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C16H16O3

Mol W.

: 256.3

Cat No.

: SA28216

Bupropion, Impurities

(S,S)-Hydroxy Bupropion

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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)

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C27H37N6O9P

Mol W.

: 620.24

Cat No.

: SA42734

Apixaban, Impurities

(S)-2-Ethylbutyl 2-aminopropanoate HCl

Please enquire for price & pack size

Out of Stock

CAS No.

: 946511-97-3 (HCl)

Mol F.

: C9H20ClNO2 (HCl)

Mol W.

: 209.71

Cat No.

: SA42736

Carbidopa, Impurities

(S)-3-(3,4-DIMETHOXYBENZYL)-2-METHYL HYDANTOIC ACID

Please enquire for price & pack size

Out of Stock

CAS No.

: 28861-00-9

Mol F.

: C13H18N2O5

Mol W.

: 282.29

Cat No.

: SA31814

Impurities, Pregabalin

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 114446-50-3

Mol F.

: C16H17ClO

Mol W.

: 260.76

Cat No.

: SA22121

Impurities, Zolmitriptan

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 152305-23-2

Mol F.

: C10H12N2O2

Mol W.

: 192.21

Cat No.

: SA11907

Impurities, Nicotine

(S)-6-Chloronicotine

Please enquire for price & pack size

Out of Stock

CAS No.

: 112091-17-5

Mol F.

: C₁₀H₁₃ClN₂

Mol W.

: 196.68

Cat No.

: SA32210

Baclofen, Impurities

(S)-Baclofen

Please enquire for price & pack size

Out of Stock

CAS No.

: 66514-99-6

Mol F.

: C10H12ClNO2

Mol W.

: 213.66

Cat No.

: SA28110

Brinzolamide, Impurities

(S)-Brinzolamide; Brinzolamide USP Related Compound A

Please enquire for price & pack size

Out of Stock

CAS No.

: 154127-19-2

Mol F.

: C12H21N3O5S3

Mol W.

: 383.51

Cat No.

: SA47201

Bupropion, Impurities

(S)-Bupropion L-Tartaric Acid Salt

Please enquire for price & pack size

Out of Stock

CAS No.

: 324548-43-8 (freebase)

Mol F.

: C17H24ClNO7

Mol W.

: 389.83

Cat No.

: SA12207

Impurities, Isoproterenol

(S)-Isoprenaline; (S)-Isoproterenol

Please enquire for price & pack size

Out of Stock

CAS No.

: 2964-04-7

Mol F.

: C11H17NO3

Mol W.

: 211.26

Cat No.

: SA25905

Impurities, Timolol

(S)-Isotimolol

$800.00 25 mg

Out of Stock

CAS No.

: 158636-96-5

Mol F.

: C13H24NO3S

Mol W.

: 316.42

Cat No.

: SA23216

Impurities, Lercanidipine

(S)-Lercanidipine HCl

Please enquire for price & pack size

Out of Stock

CAS No.

: 184866-29-3

Mol F.

: C36H42ClN3O6

Mol W.

: 648.19

Cat No.

: SA50912

Impurities, Lorcaserin

(S)-Lorcaserin

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 2059891-96-0

Mol F.

: C22H22F3N

Mol W.

: 357.41

Cat No.

: SA34216

Dapoxetine, Impurities

(S)-N-Demethyl Dapoxetine

Please enquire for price & pack size

Out of Stock

CAS No.

: 147199-39-1

Mol F.

: SA23008

Mol W.

: 291.39

Cat No.

: SA23008

Dapoxetine, Impurities

(S)-N-Didemethyl Dapoxetine

Please enquire for price & pack size

Out of Stock

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

Out of Stock

CAS No.

: 1155843-61-0

Mol F.

: C9H19NO2

Mol W.

: 173.25

Cat No.

: SA24815

Impurities, Pregabalin

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 1246816-46-5

Mol F.

: C14H27NO4

Mol W.

: 273.37

Cat No.

: SA24810

Impurities, Pregabalin

(S)-Pregabalin

Please enquire for price & pack size

Out of Stock

CAS No.

: 148553-50-8

Mol F.

: C8H17NO2

Mol W.

: 159.22999999999999

Cat No.

: SA24803

Impurities, Pregabalin

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

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C9H17NO

Mol W.

: 155.24

Cat No.

: SA24821

Impurities, Pregabalin

(S)-Pregabalin Lactam

$125.00 25 mg

Out of Stock

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

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C21H16N4O2

Mol W.

: 356.38

Cat No.

: SA51114

Impurities, Tapinarof

(Z)-Dimethoxy Tapinarof

Please enquire for price & pack size

Out of Stock

CAS No.

: 1622988-16-2

Mol F.

: C19H22O2

Mol W.

: 282.38

Cat No.

: SA51603