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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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Impurities, Terbutaline

3,5-Bis(phenylmethoxy)phenyl]oxirane

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Out of Stock

CAS No.

: 50841-47-9

Mol F.

: C₂₂H₂₀O₃

Mol W.

: 332.39

Cat No.

: SA29007

Impurities, Rosuvastatin

3,5-Di(tert-butyldimethylsilyl) Rosuvastatin

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Out of Stock

CAS No.

: 1353050-10-8

Mol F.

: C34H56FN3O6SSi2

Mol W.

: 710.06

Cat No.

: SA12121

Impurities, Rosuvastatin

3,5-Di(tert-butyldimethylsilyl) Rosuvastatin Allyl Ester

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Out of Stock

CAS No.

Mol F.

: C37H60FN3O6SSi2

Mol W.

: 750.12

Cat No.

: SA12122

Impurities, Terbutaline

3,5-Dihydroxybenzaldehyde

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Out of Stock

CAS No.

: 26153-38-8

Mol F.

: C₇H₆O₃

Mol W.

: 138.12

Cat No.

: SA29008

Impurities, Levothyroxine

3,5-Diiodo-D-isomer Levothyroxine

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Out of Stock

CAS No.

: NA

Mol F.

: C15H13I2NO4

Mol W.

: 525.08

Cat No.

: SA24730

Impurities, Niacin

3,5-Dinitropyridine

Please enquire for price & pack size

Out of Stock

CAS No.

: 940-06-7

Mol F.

: C5H3N3O4

Mol W.

: 169.09

Cat No.

: SA33108

Clomipramine, Impurities

3,7-dichloroimipramine

$495.00 25 mg

Out of Stock

CAS No.

: 115189-28-1

Mol F.

: C20H23Cl2N

Mol W.

: 348.31

Cat No.

: SA33702

Eltrombopag, Impurities

3′-Hydrazinyl-2′-hydroxybiphenyl-3-carboxylic acid

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C13H12N2O3

Mol W.

: 244.25

Cat No.

: SA51113

Impurities, Zidovudine

3’-Amino-3’-deoxythymidine

Please enquire for price & pack size

Out of Stock

CAS No.

: 52450-18-7

Mol F.

: C₁₀H₁₅N₃O₄

Mol W.

: 241.24

Cat No.

: SA12610

Flurbiprofen, Impurities

3’,4’-Dihydroxy Flurbiprofen

Please enquire for price & pack size

Out of Stock

CAS No.

: 66067-41-2

Mol F.

: C15H13FO4

Mol W.

: 276.26

Cat No.

: SA14609

Flurbiprofen, Impurities

3’,4’-Dimethoxy-2-fluoro-4-methylbiphenyl

Please enquire for price & pack size

Out of Stock

CAS No.

: 1346601-39-5

Mol F.

: C15H15FO2

Mol W.

: 246.28

Cat No.

: SA14617

Empagliflozin, Impurities

3’’’-Epi-empagliflozin Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C23H27ClO7

Mol W.

: 450.91

Cat No.

: SA15106

Impurities, Norethindrone

3α,5α-Tetrahydronorethisterone

Please enquire for price & pack size

Out of Stock

CAS No.

: 16392-60-2

Mol F.

: C20H30O2

Mol W.

: 302.45

Cat No.

: SA13438

Impurities, Norethindrone

3β,5α-Tetrahydronorethisterone

Please enquire for price & pack size

Out of Stock

CAS No.

: 6424-05-1

Mol F.

: C20H30O2

Mol W.

: 302.45

Cat No.

: SA13424

Carfilzomib, Impurities

4-((4S,7S,10S,13S)-10-benzyl-7-isobutyl-15-methyl-13-((R)-2-methyloxirane-2-carbonyl)-2,5,8,11-tetraoxo-4-phenethyl-3,6,9,12-tetraazahexade

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C40H57N5O8

Mol W.

: 735.93

Cat No.

: SA45013

Impurities, Olmesartan Medoxomil

4-(1-Methoxy-1-methylethyl)-2-propyl-1H-imidazole-5-carboxylic Acid Ethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 1092980-84-1

Mol F.

: C₁₃H₂₂N₂O₃

Mol W.

: 254.33

Cat No.

: SA17751

Impurities, Olmesartan Medoxomil

4-(1-Oxopropyl)-2-propyl-1-(triphenylmethyl)-1H-Imidazole-5-carbonitrile

Please enquire for price & pack size

Out of Stock

CAS No.

: 144689-98-5

Mol F.

: C29H27N3O

Mol W.

: 433.54

Cat No.

: SA17739

Impurities, Isavuconazole

4-(2-(3-(2,5-difluorophenyl)-3-hydroxy-4-(1H-1,2,4-triazol-1-yl)butan-2-yl)thiazol-4-yl)benzonitrile

Please enquire for price & pack size

Out of Stock

CAS No.

: 1797905-83-9

Mol F.

: C22H17F2N5OS

Mol W.

: 437.47

Cat No.

: SA44135

Aspirin, Impurities

4-(2-Acetoxybenzoyloxy)benzaldehyde

Please enquire for price & pack size

Out of Stock

CAS No.

: 203065-56-9

Mol F.

: C16H12O5

Mol W.

: 284.26

Cat No.

: SA28504

Impurities, Penciclovir

4-(2-Amino-6-chloro-9H-purin-9-yl)butyl acetate

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C11H14ClN5O2

Mol W.

: 283.70999999999998

Cat No.

: SA27706

Cariprazine, Impurities

4-(2,3-Dichlorophenyl)-1-(2-((1r,4r)-4-(3,3-dimethylureido)cyclohexyl)ethyl)piperazine 1-oxide

Please enquire for price & pack size

Out of Stock

CAS No.

: 1084891-96-2

Mol F.

: C21H32Cl2N4O2

Mol W.

: 443.41

Cat No.

: SA39712

Cariprazine, Impurities

4-(2,3-dichlorophenyl)-1-(2-((1r,4r)-4-ureidocyclohexyl)ethyl)piperazine 1-oxide

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C19H28Cl2N4O2

Mol W.

: 415.36

Cat No.

: SA39714

Cariprazine, Impurities

4-(2,3-dichlorophenyl)-N-((1r,4r)-4-(2-(4-(2,3-dichlorophenyl)piperazin-1-yl)ethyl)cyclohexyl)piperazine-1-carboxamide

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C29H37Cl4N5O

Mol W.

: 613.45

Cat No.

: SA39711

Cariprazine, Impurities

4-(2,3-Dichlorophenyl)-N,N-dimethylpiperazine-1-carboxamide

Please enquire for price & pack size

Out of Stock

CAS No.

: 2327471-74-7

Mol F.

: C13H17Cl2N3O

Mol W.

: 302.20

Cat No.

: SA39713

Impurities, Ribociclib

4-(4-(6-((7-Cyclopentyl-6-(dimethylcarbamoyl)-7H-pyrrolo[2,3-d]pyrimidin-2-yl)amino)pyridin-3-yl)piperazin-1-yl)-4-oxobutanoic acid

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C27H34N8O4

Mol W.

: 534.6

Cat No.

: SA47122

Impurities, Levothyroxine

4-(4-Ethyl-2,6-diiodophenoxy)-2,6-diiodo-phenol

Please enquire for price & pack size

Out of Stock

CAS No.

: 176258-89-2

Mol F.

: C14H10I4O2

Mol W.

: 717.85

Cat No.

: SA24724

Impurities, Levothyroxine

4-(4-Hydroxy-3,5-diiodophenoxy)-3,5-diiodo-benzenemethanol

Please enquire for price & pack size

Out of Stock

CAS No.

: 2055-94-9

Mol F.

: C13H8I4O3

Mol W.

: 719.82

Cat No.

: SA24725

Impurities, Timolol

4-(4-Morpholinyl)-1,2,5-Thiadiazol-3(2H)-one 1-Oxide Potassium Salt

Please enquire for price & pack size

Out of Stock

CAS No.

: 79844-78-3

Mol F.

: C6H8KN3O3S

Mol W.

: 241.31

Cat No.

: SA23213

Guanine, Impurities

4-[2’-(7’’-Deazaguanine)ethyl]benzoic Acid N-Hydroxysuccinimide Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 204257-65-8

Mol F.

: C₁₉H₁₇N₅O₅

Mol W.

: 395.37

Cat No.

: SA32107

Escitalopram, Impurities

4-[4-(Dimethylamino)-1-oxobutyl]-3-(hydroxymethyl)benzonitrile

Please enquire for price & pack size

Out of Stock

CAS No.

: 1433278-33-1

Mol F.

: C14H18N2O2

Mol W.

: 246.3

Cat No.

: SA21216

Impurities, Lamivudine

4-Amino-1-(2-(hydroxymethyl)-1,3-oxathiolan-5-yl)pyrimidin-2(1H)-one

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C8H11N3O3S

Mol W.

: 229.26

Cat No.

: SA22321

Bicalutamide, Impurities

4-Amino-2-fluro-N-Methylbenzamide

Please enquire for price & pack size

Out of Stock

CAS No.

: 915087-25-1

Mol F.

: C8H9FN2O

Mol W.

: 168.2

Cat No.

: SA35317

Impurities, Prucalopride

4-Amino-5-chloro-2,3-dihydrobenzofuran-7-carboxylic acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 123654-26-2

Mol F.

: C9H8ClNO3

Mol W.

: 213.62

Cat No.

: SA43108

Impurities, Rilpivirine

4-Amino-N-cyanobenzimidamide

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C8H8N4

Mol W.

: 160.18

Cat No.

: SA25411

Exemestane, Impurities

4-Androstene-3,17-dione

Please enquire for price & pack size

Out of Stock

CAS No.

: 63-05-8

Mol F.

: C19H26O2

Mol W.

: 286.42

Cat No.

: SA19102

Impurities, Tamoxifen

4-Benzyloxy β-Hydroxy Tamoxifen

Please enquire for price & pack size

Out of Stock

CAS No.

: 176671-78-6

Mol F.

: C33H35NO3

Mol W.

: 493.63

Cat No.

: SA35516

Brexpiprazole, Impurities

4-Bromo benzo[b]thiophene

Please enquire for price & pack size

Out of Stock

CAS No.

: 5118-13-8

Mol F.

: C8H5BrS

Mol W.

: 213.09

Cat No.

: SA41325

Impurities, Pregabalin

4-Bromomethylpyrrolidin-2-one

Please enquire for price & pack size

Out of Stock

CAS No.

: 975671-51-3

Mol F.

: C5H8BrNO

Mol W.

: 178.03

Cat No.

: SA24826

Impurities, Leflunomide

4-Chloro benzotrifluoride | CAS NO : 98-56-6

Please enquire for price & pack size

Out of Stock

CAS No.

: 98-56-6

Mol F.

: C7H4ClF3

Mol W.

: 180.6

Cat No.

: SA21819

Apixaban, Impurities

4-Chloro pentanoyl chloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 63480-12-6

Mol F.

: C5H8Cl2O

Mol W.

: 155.02

Cat No.

: SA39958

Impurities, Prochlorperazine Maleate

4-Chloro-10H-phenothiazine; 4-Chlorophenothiazine

Please enquire for price & pack size

Out of Stock

CAS No.

: 7369-69-9

Mol F.

: C12H8ClNS

Mol W.

: 233.72

Cat No.

: SA45604

Impurities, Omeprazole

4-Chloro-2-(chloromethyl)-3,5-dimethylpyridine

Please enquire for price & pack size

Out of Stock

CAS No.

: 142885-96-9

Mol F.

: C8H9Cl2N

Mol W.

: 190.07

Cat No.

: SA19405

Allopurinol, Impurities

4-Chloro-2,6-dimethoxypyrimidine-5-carbaldehyde

Please enquire for price & pack size

Out of Stock

CAS No.

: 134221-52-6

Mol F.

: C7H7ClN2O3

Mol W.

: 202.59

Cat No.

: SA28913

Dapagliflozin, Impurities

4-Chloro-3-(4-ethoxybenzyl)phenol

Please enquire for price & pack size

Out of Stock

CAS No.

: 1408077-50-8

Mol F.

: C15H15ClO2

Mol W.

: 262.73

Cat No.

: SA15051

Impurities, Nintedanib

4-Chloro-3-nitrobenzoic acid methyl ester

$85.00 25 mg

Out of Stock

CAS No.

: 14719-83-6

Mol F.

: C8H6ClNO4

Mol W.

: 215.59

Cat No.

: SA22516

Erlotinib, Impurities

4-Chloro-6-(2-chloroethoxy)-7-(2-methoxyethoxy)quinazoline

Please enquire for price & pack size

Out of Stock

CAS No.

: 183322-19-2

Mol F.

: C13H14Cl2N2O3

Mol W.

: 317.16

Cat No.

: SA25221

Impurities, Lorcaserin

4-Chloro-N-(2-hydroxypropyl)benzeneacetamide

Please enquire for price & pack size

Out of Stock

CAS No.

: 1030624-36-2

Mol F.

: C11H14ClNO2

Mol W.

: 227.69

Cat No.

: SA18810

Impurities, Sumatriptan

4-Chlorobutyraldehyde Diethyl Acetal

Please enquire for price & pack size

Out of Stock

CAS No.

: 6139-83-9

Mol F.

: C8H17ClO2

Mol W.

: 180.67

Cat No.

: SA34817

Impurities, Nizatidine

4-Chloromethyl-2-Dimethylamino methyl thiazole

Please enquire for price & pack size

Out of Stock

CAS No.

: 82586-71-8

Mol F.

: C7H11ClN2S

Mol W.

: 190.7

Cat No.

: SA34414

Impurities, Olmesartan Medoxomil

4-Chloromethyl-5-Methyl-1,3-dioxol-2-one

$125.00 25 mg

Out of Stock

CAS No.

: 80841-78-7

Mol F.

: C5H5ClO3

Mol W.

: 148.54

Cat No.

: SA17729