Home / Products / Impurities

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.

A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Dolutegravir, Impurities

(4R,12aS)-7-Bromo-3,4,6,8,12,12a-hexahydro-4-methyl-6,8-dioxo-2H-pyrido[1’,2’:4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxylic Acid Ethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 1246616-78-3

Mol F.

: C15H17BrN2O5

Mol W.

: 385.21

Cat No.

: SA20215

Dolutegravir, Impurities

(4R,12As)-7-Hydroxy-4-methyl-6,8-dioxo-3,4,6,8,12,12a-hexahydro-2h-pyrido[1’,2’:4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxylic Acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 1246616-73-8

Mol F.

: C13H14N2O6

Mol W.

: 294.26

Cat No.

: SA20223

Dolutegravir, Impurities

(4R,12aS)-N-[(2,4-Difluorophenyl)methyl]-3,4,6,8,12,12a-hexahydro-4-methyl-6,8-dioxo-7-(phenylmethoxy)-2H-pyrido[1’,2’:4,5]pyrazino[2,1-b][1,3]oxazine-9-carboxamide

Please enquire for price & pack size

Out of Stock

CAS No.

: 1206102-11-5

Mol F.

: C27H25F2N3O5

Mol W.

: 509.5

Cat No.

: SA20219

Atorvastatin, Impurities

(4R,6S)-6-(Cyanomethyl)-2,2-dimethyl_x0013_1,3-dioxane-4-acetic Acid tert-Butyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 196085-85-4

Mol F.

Mol W.

Cat No.

: SA17832

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

Out of Stock

CAS No.

: 1533443-76-3

Mol F.

: C8H11NO5S3

Mol W.

: 297.37

Cat No.

: SA24109

Dorzolamide, Impurities

(4R)-Dorzolamide

$1,095.00 25 mg

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Out of Stock

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)

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C17H17N3O5S

Mol W.

: 375.4

Cat No.

: SA42304

Cefaclor, Impurities

(7S)-Cefaclor

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C24H28O5

Mol W.

: 396.48

Cat No.

: SA13440

Hydrocortisone, Impurities

(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]phenanthrene-17-carboxylic acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 3597-45-3

Mol F.

: C20H28O5

Mol W.

: 348.43

Cat No.

: SA15232

Impurities, Molnupiravir

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C24H22N4O2

Mol W.

: 398.46

Cat No.

: SA51112

Impurities, Tamoxifen

(E)-4-Acetoxy Tamoxifen

Please enquire for price & pack size

Out of Stock

CAS No.

: 76117-70-9

Mol F.

: C28H31NO3

Mol W.

: 429.55

Cat No.

: SA35514

Impurities, Tamoxifen

(E)-4-Alloxycarboxyl Tamoxifen

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 173200-56-1

Mol F.

: C9H14NO

Mol W.

: 138.21

Cat No.

: SA25722

Impurities, Sitagliptin

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

Please enquire for price & pack size

Out of Stock

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)

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C25H31FN3O7S.1/2Ca

Mol W.

: 556.63

Cat No.

: SA12143

Argatroban, Impurities

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 37662-05-8

Mol F.

: C12H15NO2

Mol W.

: 205.25

Cat No.

: SA48418

Bupropion, Impurities

(R,R)-Dihydro Bupropion Hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 357637-18-4

Mol F.

: C₁₃H₂₁Cl₂NO

Mol W.

: 278.22

Cat No.

: SA12223

Efinaconazole, Impurities

(R,R)-Efinaconazole Diol

Please enquire for price & pack size

Out of Stock

CAS No.

: 1175536-50-1

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA23602

Bupropion, Impurities

(R,R)-Hydroxy Bupropion

Please enquire for price & pack size

Out of Stock

CAS No.

: 192374-15-5

Mol F.

: C₁₃H₁₈ClNO₂

Mol W.

: 255.74

Cat No.

: SA12226

Impurities, Pregabalin

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

$95.00 25 mg

Out of Stock

CAS No.

: 181289-33-8

Mol F.

: C9H17NO3

Mol W.

: 187.24

Cat No.

: SA24827

Impurities, Timolol

(R)-(+)-Timolol Maleate

Please enquire for price & pack size

Out of Stock

CAS No.

: 26839-77-0

Mol F.

: C17H28N4O7S

Mol W.

: 432.49

Cat No.

: SA23220

Gemcitabine, Impurities

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

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C17H20F2O6

Mol W.

: 358.33

Cat No.

: SA44522

Bupropion, Impurities

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 291275-46-2

Mol F.

: C9H9ClO2

Mol W.

: 184.62

Cat No.

: SA12214

Carbamazepine, Impurities

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

$295.00 25 mg

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

: 2436762-87-5

Mol F.

: C11H18F3NO4

Mol W.

: 285.26

Cat No.

: SA45014

Impurities, Levetiracetam

(R)-2-Aminobutanamide hydrochloride

Please enquire for price & pack size

Out of Stock

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

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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)

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C28H29ClN6O4

Mol W.

: 549.03

Cat No.

: SA47421

Impurities, Salbutamol

(R)-4-Benzyl Albuterol

Please enquire for price & pack size

Out of Stock

CAS No.

: 174607-68-2

Mol F.

: C20H27NO3

Mol W.

: 329.43

Cat No.

: SA26014

Impurities, Rosuvastatin

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C31H32N10O2

Mol W.

: 576.65

Cat No.

: SA49949

Baclofen, Impurities

(R)-Baclofen

Please enquire for price & pack size

Out of Stock

CAS No.

: 69308-37-8

Mol F.

: C10H12ClNO2

Mol W.

: 213.66

Cat No.

: SA28102

Bupropion, Impurities

(R)-Bupropion D-Tartaric Acid Salt

Please enquire for price & pack size

Out of Stock

CAS No.

: 437723-96-1 (Freebase)

Mol F.

: C17H24ClNO7

Mol W.

: 389.83

Cat No.

: SA12209