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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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Dorzolamide, Impurities

(4R,6S)-rel-5,6-Dihydro-4-hydroxy-6-methyl-4H-thieno[2,3-b]thiopyran-2-sulfonamide 7,7-Dioxide

$395.00 25 mg

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CAS No.

: 1533443-76-3

Mol F.

: C8H11NO5S3

Mol W.

: 297.37

Cat No.

: SA24109

Dorzolamide, Impurities

(4R)-Dorzolamide

$1,095.00 25 mg

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CAS No.

: 149249-72-9

Mol F.

: C10H16N2O4S3

Mol W.

: 324.44

Cat No.

: SA24106

Dolutegravir, Impurities

(4S,12aS)-3,4,6,8,12,12a-Hexahydro-7-hydroxy-4-methyl-6,8-dioxo-2H-pyrido[1’,2’:4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxylic Acid

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CAS No.

: NA

Mol F.

: C14H16N2O6

Mol W.

: 308.29000000000002

Cat No.

: SA20213

Empagliflozin, Impurities

(5-(4-fluorophenyl)thiophen-2-yl)(5-iodo-2-methylphenyl)methanol

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CAS No.

: 1818268-45-9

Mol F.

: C18H14FIOS

Mol W.

: 424.27

Cat No.

: SA15127

Impurities, Rosuvastatin

(5S)-6-Chloro-5-hydroxy-3-oxo-hexanoic Acid 1,1-Dimethylethyl Ester

$150.00 25 mg

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CAS No.

: 154026-92-3

Mol F.

: C10H17ClO4

Mol W.

: 236.69

Cat No.

: SA12198

Impurities, Vericiguat

(6-Amino-2-(5-fluoro-1-(2-fluorobenzyl)-1H-pyrazolo[3,4-b]pyridin-3-yl)pyrimidine-4,5-diyl)bis(methylcarbamic acid)

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CAS No.

Mol F.

: C21H18F2N8O4

Mol W.

: 484.4

Cat No.

: SA50704

Impurities, Raloxifene

(6-Hydroxy-2-(4-methoxyphenyl)benzo[b]thiophen-7-yl)(4-(2-(piperidin-1-yl)ethoxy)phenyl)methanone

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CAS No.

: NA

Mol F.

: C29H29NO4S

Mol W.

: 487.61

Cat No.

: SA24917

Cabergoline, Impurities

(6aR,9R,10aR)-7-allyl-N-(3-(dimethylamino)propyl)-N-(ethylcarbamoyl)-4,6,6a,7,8,9,10,10a-octahydroindolo[4,3-fg]quinoline-9-carboxamide

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CAS No.

: 81409-90-7

Mol F.

: C26H37N5O2

Mol W.

: 451.60

Cat No.

: SA51800

Cefadroxil, Impurities

(6S,7S)-7-((R)-2-amino-2-(4-hydroxyphenyl)acetamido)-8-oxo-3-vinyl-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

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CAS No.

: NA

Mol F.

: C17H17N3O5S

Mol W.

: 375.4

Cat No.

: SA42304

Cefaclor, Impurities

(7S)-Cefaclor

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CAS No.

: 143059-69-2

Mol F.

: C15H14ClN3O4S

Mol W.

: 367.81

Cat No.

: SA18709

Impurities, Norethindrone

(8R,9S,10R,13S,14S,17R)-17-ethynyl-13-methyl-3-oxo-2,3,8,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthrene-6,17-diyl diacetate

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CAS No.

Mol F.

: C24H28O5

Mol W.

: 396.48

Cat No.

: SA13440

Impurities, Molnupiravir

(E)-1-((2R,3S,4S,5R)-3,4-Dihydroxy-5-(hydroxymethyl)tetrahydrofuran-2-yl)-4-(hydroxyimino)-3,4-dihydropyrimidin-2(1H)-one

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CAS No.

: 13491-41-3

Mol F.

: C9H13N3O6

Mol W.

: 259.22

Cat No.

: SA46220

Impurities, Ribociclib

(E)-1,2-Bis(5-chloropyridin-2-yl)diazene 1-oxide

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CAS No.

: 120613-50-5

Mol F.

: C10H6Cl2N4O

Mol W.

: 269.1

Cat No.

: SA47117

Difluprednate, Impurities

(E)-2-((6S,8S,9R,10S,11S,13S,14S)-6,9-difluoro-11-hydroxy-10,13-dimethyl-3-oxo-7,8,9,11,12,13,15,16-octahydro-3H-cyclopenta[a]phenanthren-1

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CAS No.

: NA

Mol F.

: C21H24F2O4

Mol W.

: 378.41

Cat No.

: SA45901

Impurities, Rilpivirine

(E)-3-(4-Amino-3,5-bis(methoxymethyl)phenyl)acrylonitrile

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CAS No.

: NA

Mol F.

: C13H16N2O2

Mol W.

: 232.28

Cat No.

: SA25404

Eltrombopag, Impurities

(E)-3′-(2-(1-(3,4-dimethylphenyl)-1H-pyrazol-4(5H)-ylidene)hydrazinyl)biphenyl-3-carboxylic acid

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CAS No.

Mol F.

: C24H22N4O2

Mol W.

: 398.46

Cat No.

: SA51112

Impurities, Tamoxifen

(E)-4-Acetoxy Tamoxifen

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CAS No.

: 76117-70-9

Mol F.

: C28H31NO3

Mol W.

: 429.55

Cat No.

: SA35514

Impurities, Tamoxifen

(E)-4-Alloxycarboxyl Tamoxifen

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CAS No.

: 1287191-58-5

Mol F.

: C30H33NO4

Mol W.

: 471.59

Cat No.

: SA35515

Impurities, Terbinafine

(E)-6,6-Dimethyl-2-hepten-4-ynal

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CAS No.

: 138139-82-9

Mol F.

: C9H12O

Mol W.

: 136.19

Cat No.

: SA25717

Impurities, Terbinafine

(E)-6,6-Dimethylhept-2-en-4-yn-1-ol

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CAS No.

: 173200-56-1

Mol F.

: C9H14NO

Mol W.

: 138.21

Cat No.

: SA25722

Sitagliptin

(R,E)-(R)-3-((tert-butoxycarbonyl)amino)-4-(2,4,5-trifluorophenyl)butanoic (E)-N,N’-dicyclohexylcarbamimidic anhydride

$755.00 100 mg

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CAS No.

: 2072867-06-0

Mol F.

: C28H40F3N3O4

Mol W.

: 539.6

Cat No.

: SA10454

Impurities, Rosuvastatin

(R,E)-7-(4-(4-Fluorophenyl)-2-(2-hydroxy-N,2-dimethylpropylsulfonamido)-6-isopropylpyrimidin-5-yl)-3-hydroxy-5-oxohept-6-enoate (Rosuvastatin Impurity)

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CAS No.

Mol F.

: C25H31FN3O7S.1/2Ca

Mol W.

: 556.63

Cat No.

: SA12143

Argatroban, Impurities

(R,E)-Ethyl 2-(1-phenylethylimino)acetate

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CAS No.

: 37662-05-8

Mol F.

: C12H15NO2

Mol W.

: 205.25

Cat No.

: SA48418

Bupropion, Impurities

(R,R)-Dihydro Bupropion Hydrochloride

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CAS No.

: 357637-18-4

Mol F.

: C₁₃H₂₁Cl₂NO

Mol W.

: 278.22

Cat No.

: SA12223

Efinaconazole, Impurities

(R,R)-Efinaconazole Diol

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CAS No.

: 1175536-50-1

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA23602

Bupropion, Impurities

(R,R)-Hydroxy Bupropion

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CAS No.

: 192374-15-5

Mol F.

: C₁₃H₁₈ClNO₂

Mol W.

: 255.74

Cat No.

: SA12226

Impurities, Nebivolol

(R,S,S,S)-Nebivolol

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CAS No.

: 118457-16-2

Mol F.

: C22H25F2NO4

Mol W.

: 405.4

Cat No.

: SA14714

Impurities, Pregabalin

(R)-(-)-3-(Carbamoylmethyl)-5-methylhexanoic acid

$95.00 25 mg

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CAS No.

: 181289-33-8

Mol F.

: C9H17NO3

Mol W.

: 187.24

Cat No.

: SA24827

Impurities, Sofosbuvir

(R)-(((2S,3S,4S,5S)-D-Sofosbuvir Isomer

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CAS No.

: NA

Mol F.

: C22H29FN3O9P

Mol W.

: 529.45

Cat No.

: SA15448

Impurities, Nitrosamine

(R)-(5-Methyl-2-(2H-1,2,3-triazol-2-yl)phenyl)(7-methyl-4-nitroso-1,4-diazepan-1-yl)methanone

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CAS No.

Mol F.

: C16H20N6O2

Mol W.

: 328.38

Cat No.

: SA446141

Gemcitabine, Impurities

(R)-1-((R)-2,2-dimethyl-1,3-dioxolan-4-yl)-3-ethoxy-2,2-difluoro-3-oxopropyl benzoate impurity

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CAS No.

Mol F.

: C17H20F2O6

Mol W.

: 358.33

Cat No.

: SA44522

Bupropion, Impurities

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

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CAS No.

: 291275-46-2

Mol F.

: C9H9ClO2

Mol W.

: 184.62

Cat No.

: SA12214

Impurities, Nitrosamine

(R)-1-benzyl-5-methyl-4-nitroso-1,4-diazepane

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CAS No.

Mol F.

: C13H19N3O

Mol W.

: 233.3

Cat No.

: SA446139

Impurities, Linagliptin, Nitrosamine

(R)-1-Nitrosopiperidin-3-amine

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CAS No.

: 3031851-91-6

Mol F.

: C5H11N3O

Mol W.

: 129.2

Cat No.

: SA49955

Alogliptin, Impurities, Nitrosamine

(R)-1-nitrosopiperidin-3-amine

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CAS No.

: 3031851-91-6

Mol F.

: C5H11N3O

Mol W.

: 129.2

Cat No.

: SA54110

Carbamazepine, Impurities

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

$295.00 25 mg

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CAS No.

: 104746-03-4

Mol F.

: C15H14N2O2

Mol W.

: 254.28

Cat No.

: SA20328

Dolutegravir, Impurities

(R)-2-(4-Hydroxybutan-2-yl)-9-methoxy-1,8-dioxo-2,8-dihydro-1H-pyrido[1,2-a]pyrazine-7-carboxylic Acid

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CAS No.

: NA

Mol F.

: C14H16N2O6

Mol W.

: 308.29000000000002

Cat No.

: SA20224

Carfilzomib, Impurities

(R)-2-amino-4-methyl-1-((R)-2-methyloxiran-2-yl)pentan-1-one 2,2,2-trifluoroacetate

Please enquire for price & pack size

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CAS No.

: 2443766-79-6

Mol F.

: C11H18F3NO4

Mol W.

: 285.26

Cat No.

: SA45015

Carfilzomib, Impurities

(R)-2-Amino-4-methyl-1-((S)-2-methyloxiran-2-yl)pentan-1-one 2,2,2-trifluoroacetate

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CAS No.

: 2436762-87-5

Mol F.

: C11H18F3NO4

Mol W.

: 285.26

Cat No.

: SA45014

Levetiracetam

(R)-2-Aminobutanamide hydrochloride

$110.00 100 mg

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CAS No.

: 103765-03-3 (HCl)

Mol F.

: C11H13NO3

Mol W.

: 207.23

Cat No.

: SA46001

Benazepril, Impurities

(R)-2-Hydroxy-4-phenylbutyric Acid Ethyl Ester

$79.00 25 mg

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CAS No.

: 90315-82-5

Mol F.

: C₁₂H₁₆O₃

Mol W.

: 208.25

Cat No.

: SA29609

Atomoxetine, Impurities

(R)-3-Azido-1-phenyl-1-(2-methylphenoxy)propane

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CAS No.

: 1217813-19-8

Mol F.

: C16H17N3O

Mol W.

: 267.33

Cat No.

: SA22119

Atomoxetine, Impurities

(R)-3-Chloro-1-phenyl-1-[2-methyl-4-[(tert-butoxycarbonyl)oxy]phenoxy]propane

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CAS No.

: 457634-25-2

Mol F.

: C21H25ClO4

Mol W.

: 376.87

Cat No.

: SA22120

Ibrutinib, Impurities

(R)-4-(3-(4-amino-3-(4-phenoxyphenyl)-1H-pyrazolo[3, 4-d]pyrimidin-1-yl)piperidine-1-carbonyl)pent-4-enoic acid, hydrochloride (1:1)

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CAS No.

Mol F.

: C28H29ClN6O4

Mol W.

: 549.03

Cat No.

: SA47421

Impurities, Salbutamol

(R)-4-Benzyl Albuterol

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CAS No.

: 174607-68-2

Mol F.

: C20H27NO3

Mol W.

: 329.43

Cat No.

: SA26014

Rosuvastatin

(R)-4-chloro-3-(trimethylsilyloxy)butanenitrile

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CAS No.

: 927674-56-4

Mol F.

: C7H14ClNOSi

Mol W.

: 191.73

Cat No.

: SA121126

Impurities, Linagliptin

(R)-8-(3-aminopiperidin-1-yl)-1,7-di(but-2-yn-1-yl)-3-methyl-3,7-dihydro-1H-purine-2,6-dione

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CAS No.

: 2749409-37-6

Mol F.

: C19H24N6O2

Mol W.

: 368.4

Cat No.

: SA49946

Impurities, Linagliptin

(R)-8-(3-aminopiperidin-1-yl)-3-methyl-1,7-bis((4-methylquinazolin-2-yl)methyl)-1H-purine-2,6(3H,7H)-dione

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CAS No.

Mol F.

: C31H32N10O2

Mol W.

: 576.65

Cat No.

: SA49949

Azelastine, Impurities

(R)-Azelastine HCl

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CAS No.

: 153408-28-7

Mol F.

: C22H24ClN3O : HCl

Mol W.

: 381.9 : 36.5

Cat No.

: SA54701

Baclofen, Impurities

(R)-Baclofen

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CAS No.

: 69308-37-8

Mol F.

: C10H12ClNO2

Mol W.

: 213.66

Cat No.

: SA28102