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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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Impurities, Loteprednol

Dechloromethyl Loteprednol Etabonate; Prednisolone 17-acid-17-ethylcarbonate

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In Stock

CAS No.

: 133991-63-6

Mol F.

: C23H30O7

Mol W.

: 418.48

Cat No.

: SA27605

Colesevelam, Impurities

Decyl Aminoquat

$400.00 25 mg

In Stock

CAS No.

: NA

Mol F.

: C19H43BrN2

Mol W.

: 379.46

Cat No.

: SA10203

Colesevelam, Impurities

Decylamine hydrochloride

$70.00 25 mg

In Stock

CAS No.

: 143-09-9

Mol F.

: C10H24NCl

Mol W.

: 192.75

Cat No.

: SA10205

Deferasirox, Impurities

Deferasirox 1,2-isomer

Please enquire for price & pack size

In Stock

CAS No.

: 201530-78-1

Mol F.

: C21H15N3O4

Mol W.

: 373.36

Cat No.

: SA25106

Deferasirox, Impurities

Deferasirox 1,3-isomer

Please enquire for price & pack size

In Stock

CAS No.

: 2254105-61-6

Mol F.

: C21H15N3O4

Mol W.

: 373.36

Cat No.

: SA25107

Deferasirox, Impurities

Deferasirox Benzamide Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 65-45-2

Mol F.

: C7H7NO2

Mol W.

: 137.14

Cat No.

: SA25112

Deferasirox, Impurities

Deferasirox Benzoxazin Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1218-69-5

Mol F.

: C14H9NO3

Mol W.

: 239.23

Cat No.

: SA25101

Deferasirox, Impurities

Deferasirox Diacyl Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1972-71-0

Mol F.

: C14H11NO4

Mol W.

: 257.24

Cat No.

: SA25104

Deferasirox, Impurities

Deferasirox Ethyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 201530-79-2

Mol F.

: C23H19N3O4

Mol W.

: 401.41

Cat No.

: SA25102

Dolutegravir

Defluoro Dolutegravir

Please enquire for price & pack size

In Stock

CAS No.

: 1863916-88-4

Mol F.

: C20H20FN3O5

Mol W.

: 401.39

Cat No.

: SA20209

Impurities, Linezolid

Defluoro Linezolid

Please enquire for price & pack size

In Stock

CAS No.

: 556801-15-1

Mol F.

: C₁₆H₂₁N₃O₄

Mol W.

: 319.36

Cat No.

: SA17502

Impurities, Isoproterenol

Dehydroxy Isoproterenol

Please enquire for price & pack size

In Stock

CAS No.

: 3506-32-9(Base);5178-52-9(HClsalt)

Mol F.

: C11H17NO2

Mol W.

: 195.26

Cat No.

: SA25902

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

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In Stock

CAS No.

: 147083-12-3

Mol F.

: C18H23N3

Mol W.

: 281.4

Cat No.

: SA31006

Ezetimibe, Impurities

Des F-A Ezetimibe

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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

$255.00 50 mg

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