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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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Buspirone, Impurities

4-(4-(Pyrimidin-2-yl)piperazin-1-yl)butan-1-ol

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In Stock

CAS No.

: 223461-35-6

Mol F.

: C12H20N4O

Mol W.

: 236.31

Cat No.

: SA25820

Impurities, Losartan

4-(azidomethyl)-2-butyl-5-chloro-1H-imidazole

$155.00 25 mg

In Stock

CAS No.

: 2353190-33-5

Mol F.

: C8H12ClN5

Mol W.

: 213.67

Cat No.

: SA26732

Impurities, Prazosin

4-(Benzyloxy)-5-methoxy-2-nitrobenzaldehyde

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In Stock

CAS No.

: NA

Mol F.

: C15H13NO5

Mol W.

: 287.27

Cat No.

: SA24210

Impurities, Prazosin

4-(Benzyloxy)-5-methoxy-2-nitrobenzoic acid

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In Stock

CAS No.

: 60547-92-4

Mol F.

: C15H13NO6

Mol W.

: 303.27

Cat No.

: SA24211

Etoricoxib, Impurities

4-(Methylsulfonyl)phenylacetic Acid

Please enquire for price & pack size

In Stock

CAS No.

: 90536-66-6

Mol F.

: C9H10O4S

Mol W.

: 214.24

Cat No.

: SA41603

Dapagliflozin, Impurities

4-Bromo-1-chloro-2-(2-ethoxybenzyl)benzene

$245.00 25 mg

In Stock

CAS No.

: 1830346-16-1

Mol F.

: C15H14BrClO

Mol W.

: 325.63

Cat No.

: SA15060

Dapagliflozin, Impurities

4-Bromo-1-chloro-2-(4-ethoxybenzyl)benzene

$125.00 25 mg

In Stock

CAS No.

: 461432-23-5

Mol F.

: C15H14BrClO

Mol W.

: 325.63

Cat No.

: SA15020

Empagliflozin, Impurities

4-Bromo-1-chloro-2-(4-fluorobenzyl)benzene

Please enquire for price & pack size

In Stock

CAS No.

: 1628918-33-1

Mol F.

: C13H9BrClF

Mol W.

: 299.57

Cat No.

: SA15150

Bupropion, Impurities

4-Chloro Bupropion Fumarate

$30.00 50 mg

In Stock

CAS No.

: 1193779-36-0

Mol F.

: C₁₇H₂₁Cl₂NO₅

Mol W.

: 390.26

Cat No.

: SA12216

Dapagliflozin, Impurities

4-chloro-3-(4-ethoxybenzyl)phenyl)trimethylsilane

$145.00 25 mg

In Stock

CAS No.

: 2133407-73-3

Mol F.

: C18H23ClOSi

Mol W.

: 318.91

Cat No.

: SA15017

Bumetanide, Impurities

4-Chloro-3-nitro-5-sulfamoylbenzoic Acid

$100.00 25 mg

In Stock

CAS No.

: 22892-96-2

Mol F.

: C7H5ClN2O6S

Mol W.

: 280.64

Cat No.

: SA24406

Impurities, Nizatidine

4-Chloromethyl-2-Dimethylaminomethyl-4-hydroxythiazoline

Please enquire for price & pack size

In Stock

CAS No.

: 92759-37-0

Mol F.

: C7H13ClN2OS

Mol W.

: 208.7

Cat No.

: SA34415

Dolutegravir, Impurities

4-Defluoro Dolutegravir

Please enquire for price & pack size

In Stock

CAS No.

: 1863916-87-3

Mol F.

: C20H20FN3O5

Mol W.

: 401.39

Cat No.

: SA20210

Escitalopram, Impurities

4-Descyano 4-Bromo Citadiol

Please enquire for price & pack size

In Stock

CAS No.

: 488148-10-3

Mol F.

: C19H23BrFNO2

Mol W.

: 396.29

Cat No.

: SA21215

Impurities, Sitagliptin

4-desfluoro 3-oxobutanoate methyl ester Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C11H10F2O3

Mol W.

: 228.19

Cat No.

: SA10446

Impurities, Sitagliptin

4-desfluoro N-Boc methyl ester Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C16H21F2NO4

Mol W.

: 329.34

Cat No.

: SA10447

Impurities, Sitagliptin

4-Desfluoro Sitagliptin; Sitagliptin EP Impurity B

$295.00 25 mg

In Stock

CAS No.

: 1345822-87-8; 486460-31-5

Mol F.

: C16H16F5N5O

Mol W.

: 389.32

Cat No.

: SA10411

Dolutegravir, Impurities

4-Desfluoro-6-fluoro Dolutegravir

Please enquire for price & pack size

In Stock

CAS No.

: 2244161-72-4

Mol F.

: C20H19F2N3O5

Mol W.

: 419.38

Cat No.

: SA20212

Impurities, Neostigmine

4-dimethyl amino phenol

Please enquire for price & pack size

In Stock

CAS No.

: 619-60-3

Mol F.

: C8H11NO

Mol W.

: 137.16999999999999

Cat No.

: SA19703

Bupropion, Impurities

4-Fluoro Bupropion

$145.00 25 mg

In Stock

CAS No.

: 1076198-12-3

Mol F.

: C₁₃H₁₈FNO

Mol W.

: 223.29

Cat No.

: SA12224

Bupropion, Impurities

4-Fluorohydroxy Bupropion

$145.00 25 mg

In Stock

CAS No.

: 1076198-13-4

Mol F.

: C₁₃H₁₈FNO₂

Mol W.

: 239.29

Cat No.

: SA12225

Deferasirox, Impurities

4-Hydrazinobenzoic Acid Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 619-67-0

Mol F.

: C7H8N2O2

Mol W.

: 152.15

Cat No.

: SA25105

Impurities, Venlafaxine

4-Hydroxy-α-(1-hydroxycyclohexyl)benzeneacetonitrile

Please enquire for price & pack size

In Stock

CAS No.

: 918344-20-4

Mol F.

: C14H17NO2

Mol W.

: 231.29

Cat No.

: SA22733

Clotrimazole, Impurities

4-methyl-1H-imidazole Clotrimazole

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C23H19ClN2

Mol W.

: 358.86

Cat No.

: SA11610

Efinaconazole, Impurities

4-Methylenepiperidine HCl

Please enquire for price & pack size

In Stock

CAS No.

: 144230-50-2

Mol F.

: C6H12ClN

Mol W.

: 133.62

Cat No.

: SA23612

Apixaban, Impurities

4-Morpholinepentanamide

$90.00 25 mg

In Stock

CAS No.

: 1872894-62-6

Mol F.

: C9H18N2O2

Mol W.

: 186.25

Cat No.

: SA39943

Apremilast, Impurities

4-Nitrophthalic acid

$79.00 25 mg

In Stock

CAS No.

: 610-27-5

Mol F.

: C8H5NO6

Mol W.

: 211.13

Cat No.

: SA30014

Impurities, Nitrosamine

4-Nitrosomethylaminopyridine

Please enquire for price & pack size

In Stock

CAS No.

: 16219-99-1

Mol F.

: C6H7N3O

Mol W.

: 137.14

Cat No.

: SA44654

Dapagliflozin, Impurities

4,4′-dichloro-3,3′-bis(4-ethoxybenzyl)-1,1′-biphenyl

$186.00 10 mg

In Stock

CAS No.

: 2176485-21-3

Mol F.

: C30H28Cl2O2

Mol W.

: 491.44

Cat No.

: SA15007

Impurities, Olmesartan Medoxomil

4,5-Bis(chloromethyl)-1,3-dioxol-2-one

$95.00 25 mg

In Stock

CAS No.

: 1443544-27-1

Mol F.

: C5H4Cl2O3

Mol W.

: 182.99

Cat No.

: SA17702

Impurities, Raloxifene

4,6-di(tert-Butyldimethylsily) Raloxifene

Please enquire for price & pack size

In Stock

CAS No.

: 182249-24-7

Mol F.

: C40H55NO4SSi2

Mol W.

: 702.1

Cat No.

: SA24910

Bosentan, Impurities

4,6-Dichloro-5-(2-methoxyphenoxy)-2,2’-bipyrimidine

Please enquire for price & pack size

In Stock

CAS No.

: 150728-13-5

Mol F.

: C15H10Cl2N4O2

Mol W.

: 349.17

Cat No.

: SA28605

Impurities, Ticagrelor

4,6-Dichloro-5-nitro-2-(propylthio)pyrimidine

Please enquire for price & pack size

In Stock

CAS No.

: 145783-14-8

Mol F.

: C7H7Cl2N3O2S

Mol W.

: 268.12

Cat No.

: SA32516

Impurities, Irbesartan

4′-(azidomethyl)-[1,1′-biphenyl]-2-carbonitrile

Please enquire for price & pack size

In Stock

CAS No.

: 133690-91-2

Mol F.

: C14H10N4

Mol W.

: 234.3

Cat No.

: SA23318

Diltiazem, Impurities

4’-O-Desmethyl 4’-O-Acetyl Diltiazem

$195.00 25 mg

In Stock

CAS No.

: 85365-35-1

Mol F.

: C23H26N2O5S

Mol W.

: 442.53

Cat No.

: SA19516

Impurities, Losartan

4′-((5-(azido methyl)-2-butyl-4-chloro-1H-imidazol-1-yl)methyl)-[1,1′-biphenyl]-2-carbonitrile

$155.00 25 mg

In Stock

CAS No.

: 2755908-48-4

Mol F.

: C22H21ClN6

Mol W.

: 404.9

Cat No.

: SA26733

Impurities, Losartan

4′-(azidomethyl)biphenyl-2-carboxamide

$255.00 25 mg

In Stock

CAS No.

: 2763750-28-1

Mol F.

: C14H12N4O

Mol W.

: 252.27

Cat No.

: SA26730

Impurities, Losartan

4′-(azidomethyl)biphenyl-2-carboxylic acid; Losartan Impurity 10

$255.00 25 mg

In Stock

CAS No.

: 2758005-15-9

Mol F.

: C14H11N3O2

Mol W.

: 253.26

Cat No.

: SA26729

Ezetimibe, Impurities

4′-O-Benzyloxy Ezetimibe

$150.00 25 mg

In Stock

CAS No.

: 163222-32-0

Mol F.

: C31H27F2NO3

Mol W.

: 499.55

Cat No.

: SA14806

Impurities, Rosuvastatin

4S,6R Acetonide t-Butyl Ester

$350.00 25 mg

In Stock

CAS No.

Mol F.

: C29H40FN3O6S

Mol W.

: 577.71

Cat No.

: SA121103

Impurities, Sitagliptin

5-(2-(2,5-difluorophenyl)-1-hydroxyethylidene)-2,2-dimethyl-1,3-dioxane-4,6-dione

Please enquire for price & pack size

In Stock

CAS No.

: 764667-66-5

Mol F.

: C14H12F2O5

Mol W.

: 298.24

Cat No.

: SA10445

Ezetimibe, Impurities

5-(2-FLUOROPHENYL)-5-OXAPENTANOIC ACID; 5-(2-Fluorophenyl)-5-oxovaleric Acid

$100.00 25 mg

In Stock

CAS No.

: 199664-70-5

Mol F.

: C11H11FO3

Mol W.

: 210.2

Cat No.

: SA14836

Ezetimibe, Impurities

5-(3-Fluorophenyl)-5-oxovaleric acid

$150.00 25 mg

In Stock

CAS No.

: 845790-38-7

Mol F.

: C11H11FO3

Mol W.

: 210.2

Cat No.

: SA14837

Impurities, Losartan

5-(4′-Formyl-2-biphenylyl)-1H-tetrazole

Please enquire for price & pack size

In Stock

CAS No.

: 151052-40-3

Mol F.

: C14H10N4O

Mol W.

: 250.26

Cat No.

: SA26725

Impurities, Olmesartan Medoxomil

5-(4′-methylbiphenyl-2-yl)-1- trityl-1H-tetrazole

Please enquire for price & pack size

In Stock

CAS No.

: 124750-53-4

Mol F.

: C33H26N4

Mol W.

: 478.59

Cat No.

: SA17757

Impurities, Sitagliptin

5-[1-Hydroxy-2-(2,4,5-trifluorophenyl)ethylidene]-2,2-dimethyl-1,3-dioxane-4,6-dione

$95.00 25 mg

In Stock

CAS No.

: 764667-64-3

Mol F.

: C14H11F3O5

Mol W.

: 316.23

Cat No.

: SA10437

Carbamazepine, Impurities

5-Acetyl-10,11-dihydro-5H-dibenzo[b,f]azepine

$95.00 25 mg

In Stock

CAS No.

: 13080-75-6

Mol F.

: C16H15NO

Mol W.

: 237.3

Cat No.

: SA20306

Impurities, Ticagrelor

5-Amino-4,6-dichloro-2-(propylthio)pyrimidine

Please enquire for price & pack size

In Stock

CAS No.

: 145783-15-9

Mol F.

: C7H9Cl2N3S

Mol W.

: 238.13

Cat No.

: SA32519

Eslicarbazepine, Impurities

5-carbamoyl-10,11-dihydro-5H-dibenzo[b,f]azepin-10-yl propionate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C18H18N2O3

Mol W.

: 310.35

Cat No.

: SA28808

Bupropion, Impurities

5-Chloro Bupropion Fumarate

$125.00 25 mg

In Stock

CAS No.

: 1346603-00-6; 1193779-48-4 (freebase)

Mol F.

: C17H21Cl2NO5

Mol W.

: 309.05

Cat No.

: SA12215