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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, Penciclovir

Dehydroxy-(chloro) Penciclovir; Penciclovir Impurity A

$295.00 25 mg

In Stock

CAS No.

: 100199-40-4

Mol F.

: C10H14ClN5O2

Mol W.

: 271.7

Cat No.

: SA27700

Cortisone Acetate, Impurities

Delta 6,7 Cortisone Acetate

Please enquire for price & pack size

In Stock

CAS No.

: 2435-02-1

Mol F.

: C23H28O6

Mol W.

: 400.47

Cat No.

: SA43203

Cortisone Acetate, Impurities

Delta 8,9 Cortisone Acetate

Please enquire for price & pack size

In Stock

CAS No.

: 1856-26-4

Mol F.

: C23H28O6

Mol W.

: 400.5

Cat No.

: SA43202

Betamethasone, Impurities

Delta-16, 17-betamethasone (8S,9R,10S,11S,13S,14S)-9-fluoro-11-hydroxy-17-(2-hydroxyacetyl)-10,13,16-trimethyl-6,7,8,9,10,11,12,13,14,15-decahydro-3H-cyclopenta[a]phenanthren-3-one

$1,095.00 25 mg

In Stock

CAS No.

Mol F.

: C22H27FO4

Mol W.

: 374.45

Cat No.

: SA26614

Impurities, Ursodiol

Deoxycholic acid

Please enquire for price & pack size

In Stock

CAS No.

: 83-44-3

Mol F.

: C24H40O4

Mol W.

: 392.57

Cat No.

: SA31205

Alcaftadine, Impurities

Des Carbaldehyde Alcaftadine

Please enquire for price & pack size

In Stock

CAS No.

: 147083-12-3

Mol F.

: C18H23N3

Mol W.

: 281.4

Cat No.

: SA31006

Ezetimibe, Impurities

Des F-A Ezetimibe

Please enquire for price & pack size

In Stock

CAS No.

: 163222-31-9

Mol F.

: C24H20FNO3

Mol W.

: 389.4

Cat No.

: SA14850

Ezetimibe, Impurities

Des F-B Ezetimibe 29

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C24H20FNO3

Mol W.

: 389.4

Cat No.

: SA14851

Impurities, Valsartan

Des-[(S)-3-Methyl-2-pentanamidobutanoic Acid] Valsartan 4-Azidomethyl

Please enquire for price & pack size

In Stock

CAS No.

: 152708-24-2

Mol F.

: C14H11N7

Mol W.

: 277.28

Cat No.

: SA33318

Fosaprepitant, Impurities

Des-fluoro CAH Impurity

$450.00 25 mg

In Stock

CAS No.

: 171338-33-3

Mol F.

: C20H19F6NO2

Mol W.

: 419.36

Cat No.

: SA45408

Fluticasone Furoate, Impurities

Des-Fluoromethyl S-Methyl Fluticasone Furoate

$250.00 25 mg

In Stock

CAS No.

: 397864-58-3

Mol F.

: C27H30F2O6S

Mol W.

: 520.59

Cat No.

: SA48211

Empagliflozin, Impurities

Des(1,5-anhydro-D-glucitol) Empagliflozin

$230.00 25 mg

In Stock

CAS No.

: 2517968-35-1

Mol F.

: C17H17ClO2

Mol W.

: 288.77

Cat No.

: SA15101

Empagliflozin, Impurities

Des(1,5-anhydro-D-glucitol)-bromo Empagliflozin

$169.00 25 mg

In Stock

CAS No.

: 915095-89-5

Mol F.

: C17H16BrClO2

Mol W.

: 367.66

Cat No.

: SA15111

Impurities, Losartan

Des[2-(1H-tetrazol-5-yl)] 2-Cyanolosartan Carboxaldehyde

$195.00 25 mg

In Stock

CAS No.

: 124750-67-0

Mol F.

: C22H20ClN3O

Mol W.

: 377.872

Cat No.

: SA26727

Impurities, Losartan

Des[2′-(1H-tetrazol-5-yl)] 2-cyanolosartan

$155.00 25 mg

In Stock

CAS No.

: 114772-55-3

Mol F.

: C22H22ClN3O

Mol W.

: 379.88

Cat No.

: SA26724

Diltiazem, Impurities

Des[5-(2-dimethylamino)ethyl] Diltiazem; Diltiazem EP Impurity B

$95.00 25 mg

In Stock

CAS No.

: 87447-47-0

Mol F.

: C18H17NO4S

Mol W.

: 343.4

Cat No.

: SA19506

Diltiazem, Impurities

Des[5-(2-dimethylamino)ethyl] N-ethene Diltiazem

$395.00 25 mg

In Stock

CAS No.

Mol F.

: C20H19NO4S

Mol W.

: 369.44

Cat No.

: SA19509

Diltiazem, Impurities

Des[5-(2-dimethylamino)ethyl] N-Methyl Diltiazem

$255.00 25 mg

In Stock

CAS No.

: 2067323-40-2; 30842-48-9

Mol F.

: C19H19NO4S

Mol W.

: 357.43

Cat No.

: SA19508

Diltiazem, Impurities

Desacetyl N,O-didesmethyl diltiazem

$295.00 25 mg

In Stock

CAS No.

: 86408-42-6; 142926-09-8 (HCl Salt)

Mol F.

: C18H20N2O3S

Mol W.

: 344.43

Cat No.

: SA19522

Donepezil, Impurities

Desbenzyl Donepezil Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 120013-39-0

Mol F.

: C₁₇H₂₄ClNO₃

Mol W.

: 325.83

Cat No.

: SA34300

Bromfenac, Impurities

Desbromo Bromfenac impurity

Please enquire for price & pack size

In Stock

CAS No.

: 51579-82-9 (Free base); 61618-27-7 (Na salt)

Mol F.

: C15H13NO3/Na

Mol W.

: 255.27/22.99

Cat No.

: SA18900

Impurities, Moxifloxacin

Descarboxy Moxifloxacin

$175.00 25 mg

In Stock

CAS No.

: 1322062-57-6

Mol F.

: C20H24FN3O2

Mol W.

: 357.42

Cat No.

: SA30719

Bupropion, Impurities

Deschloro Bupropion Hydrochloride

$125.00 25 mg

In Stock

CAS No.

: 63199-74-6

Mol F.

: C13H20ClNO

Mol W.

: 241.76

Cat No.

: SA12218

Empagliflozin, Impurities

Deschloro Empagliflozin

$180.00 10 mg

In Stock

CAS No.

: 2452301-27-6

Mol F.

: C23H28O7

Mol W.

: 416.46

Cat No.

: SA15110

Ertugliflozin, Impurities

Deschloro Ertugliflozin Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C22H26O7

Mol W.

: 402.44

Cat No.

: SA36808

Impurities, Rivaroxaban

Deschloro Rivoroxaban

$120.00 25 mg

In Stock

CAS No.

: 1415566-28-7

Mol F.

: C₁₉H₁₉N₃O₅S

Mol W.

: 401.44

Cat No.

: SA18606

Dolutegravir, Impurities

Desdifluoro Dolutegravir

Please enquire for price & pack size

In Stock

CAS No.

: 2244161-71-3

Mol F.

: C20H21N3O5

Mol W.

: 383.4

Cat No.

: SA20211

Azilsartan, Impurities

Desethyl Azilsartan Medoxomil

Please enquire for price & pack size

In Stock

CAS No.

: 1417576-00-1

Mol F.

: C28H20N4O8

Mol W.

: 540.48

Cat No.

: SA42808

Clomifene, Impurities

Desethylclomifene

Please enquire for price & pack size

In Stock

CAS No.

: 1310815-19-0

Mol F.

: C24H24ClNO

Mol W.

: 377.9

Cat No.

: SA21708

Citalopram, Impurities

Desfluoro Citalopram Oxalate

Please enquire for price & pack size

In Stock

CAS No.

: 1093072-86-6

Mol F.

: C22H24N2O5

Mol W.

: 396.44

Cat No.

: SA17001

Ezetimibe, Impurities

Desfluoro Ezetimibe; Ezetimibe Desfluoroaniline Analog

$299.00 25 mg

In Stock

CAS No.

: 302781-98-2

Mol F.

: C24H22FNO3

Mol W.

: 391.43

Cat No.

: SA14805

Fosaprepitant, Impurities

Desfluoro Fosaprepitant Dimeglumine

$750.00 25 mg

In Stock

CAS No.

Mol F.

: C37H56F6N6O16P

Mol W.

: 985.83

Cat No.

: SA45421

Abacavir, Impurities

Desformyl Abaca-1; Abacavir Related Compound B

$195.00 25 mg

In Stock

CAS No.

: 141271-11-6

Mol F.

: C10H14ClN5O

Mol W.

: 255.09

Cat No.

: SA18100

Empagliflozin, Impurities

Desglucosylempagliflozin 4,4’-Dimer; Empagliflozin Dimer

$265.00 10 mg

In Stock

CAS No.

Mol F.

: C34H32Cl2O4

Mol W.

: 575.52

Cat No.

: SA15109

Desonide, Impurities

Desglycolaldehyde-carboxyl Desonide

Please enquire for price & pack size

In Stock

CAS No.

: 117782-94-2

Mol F.

: C₂₃H₃₀O₆

Mol W.

: 402.48

Cat No.

: SA19008

Formoterol, Impurities

Deshydroxy Impurity (Formoterol Fumarate)

$600.00 25 mg

In Stock

CAS No.

: 477552-93-5

Mol F.

: C19H24N2O3

Mol W.

: 328.41

Cat No.

: SA21110

Fluphenazine, Impurities

Deshydroxyethyl Fluphenazine

Please enquire for price & pack size

In Stock

CAS No.

: 2804-16-2 (Free); 4617-82-7 (HCl)

Mol F.

: C20H22F3N3S

Mol W.

: 393.47

Cat No.

: SA39307

Desloratadine, Impurities

Desloratadine Dehydro Impurity

$355.00 25 mg

In Stock

CAS No.

: 117811-20-8

Mol F.

: C19H17ClN2

Mol W.

: 308.8

Cat No.

: SA48805

Desloratadine, Impurities

Desloratadine EP Impurity A

$355.00 25 mg

In Stock

CAS No.

: 298220-99-2

Mol F.

: C19H20ClFN2

Mol W.

: 330.8

Cat No.

: SA48801

Impurities, Loratadine

Desloratadine Nitroso Impurity

$155.00 25 mg

In Stock

CAS No.

: 1246819-22-6

Mol F.

: C19H18ClN3O

Mol W.

: 339.82

Cat No.

: SA34034

Gatifloxacin, Impurities

Desmethyl Gatifloxacin

Please enquire for price & pack size

In Stock

CAS No.

: 112811-57-1

Mol F.

: C18H20FN3O4

Mol W.

: 361.37

Cat No.

: SA37904

Impurities, Rilpivirine

Desmethyl Impurity 4-Iodo-2,6-dimethyl

Please enquire for price & pack size

In Stock

CAS No.

: 13194-68-8

Mol F.

: C7H8IN

Mol W.

: 233.05

Cat No.

: SA25419

Impurities, Nintedanib

Desmethyl Nintedanib

Please enquire for price & pack size

In Stock

CAS No.

: 894783-61-0

Mol F.

: C30H31N5O4

Mol W.

: 525.6

Cat No.

: SA22525

Impurities, Venlafaxine

Desmethyl Venlafaxine N-Oxide

$255.00 25 mg

In Stock

CAS No.

: 1021933-95-8

Mol F.

: C16H25NO3

Mol W.

: 279.37

Cat No.

: SA22736

Desonide, Impurities

Desonide

Please enquire for price & pack size

In Stock

CAS No.

: 638-94-8

Mol F.

: C₂₄H₃₂O₆

Mol W.

: 416.51

Cat No.

: SA19001

Desonide, Impurities

Desonide 21-Acetate

Please enquire for price & pack size

In Stock

CAS No.

: 25092-25-5

Mol F.

: C₂₆H₃₄O₇

Mol W.

: 458.54

Cat No.

: SA19002

Desoximetasone, Impurities

Desoximetasone Oxidative Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 75262-69-0

Mol F.

: C21H27FO4

Mol W.

: 362.44

Cat No.

: SA19204

Desoximetasone, Impurities

Desoximrthasone-delta-9,11-analog

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C22H28O3

Mol W.

: 340.46

Cat No.

: SA19202

Dexamethasone, Impurities

Desoxymetasone

Please enquire for price & pack size

In Stock

CAS No.

: 382-67-2

Mol F.

: C22H29FO4

Mol W.

: 376.46

Cat No.

: SA15508

Dexamethasone, Impurities

Dexamethasone 17-Propionate Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 15423-89-9

Mol F.

: C25H33FO6

Mol W.

: 448.52

Cat No.

: SA15522