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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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Des-[(S)-3-Methyl-2-pentanamidobutanoic Acid] Valsartan 4-Azidomethyl | 152708-24-2 | 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

Des-Fluoromethyl S-Methyl Fluticasone Furoate | 397864-58-3 | Fluticasone Furoate

,

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

Des(1,5-anhydro-D-glucitol) Empagliflozin | 2517968-35-1 | Empagliflozin

,

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

Des(1,5-anhydro-D-glucitol)-bromo Empagliflozin | 915095-89-5 | Empagliflozin

,

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

Des[2-(1H-tetrazol-5-yl)] 2-Cyanolosartan Carboxaldehyde | 124750-67-0 | Losartan

Des[2-(1H-tetrazol-5-yl)] 2-Cyanolosartan Carboxaldehyde
$125.00 10 mg
In Stock

CAS No.

: 124750-67-0

Mol F.

: C22H20ClN3O

Mol W.

: 377.872

Cat No.

: SA26727

Des[2′-(1H-tetrazol-5-yl)] 2-cyanolosartan | 114772-55-3 | 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

Des[5-(2-dimethylamino)ethyl] Diltiazem; Diltiazem EP Impurity B | 87447-47-0 | Diltiazem

,

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

Des[5-(2-dimethylamino)ethyl] N-ethene Diltiazem; Diltiazem DTZ-II Impurity | Diltiazem

Des[5-(2-dimethylamino)ethyl] N-ethene Diltiazem; Diltiazem DTZ-II Impurity
$225.00 10 mg
In Stock

CAS No.

Mol F.

: C20H19NO4S

Mol W.

: 369.44

Cat No.

: SA19509

Des[5-(2-dimethylamino)ethyl] N-Methyl Diltiazem; Diltiazem DTH-I IMPURITY | 2067323-40-2; 30842-48-9 | Diltiazem

Des[5-(2-dimethylamino)ethyl] N-Methyl Diltiazem; Diltiazem DTH-I IMPURITY
$155.00 10 mg
In Stock

CAS No.

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

Mol F.

: C19H19NO4S

Mol W.

: 357.43

Cat No.

: SA19508

Desacetyl N,O-didesmethyl diltiazem | 86408-42-6; 142926-09-8 (HCl Salt) | Diltiazem

Desacetyl N,O-didesmethyl diltiazem
$175.00 10 mg
In Stock

CAS No.

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

Mol F.

: C18H20N2O3S

Mol W.

: 344.43

Cat No.

: SA19522

Desaryl celecoxib | 219986-64-8 | Celecoxib

Desaryl celecoxib
$155.00 100 mg
In Stock

CAS No.

: 219986-64-8

Mol F.

: C11H9F3N2

Mol W.

: 226.2

Cat No.

: SA11301

Desbenzyl Donepezil Impurity; Donepezil EP Impurity A | 120013-39-0 | Donepezil

Desbenzyl Donepezil Impurity; Donepezil EP Impurity A
$155.00 100 mg
PLEASE ENQUIRE

CAS No.

: 120013-39-0

Mol F.

: C₁₇H₂₄ClNO₃

Mol W.

: 325.83

Cat No.

: SA34300

Desbromo Bromfenac impurity | 51579-82-9 (Free base); 61618-27-7 (Na salt) | Bromfenac

,

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

Descarboxy Moxifloxacin | 1322062-57-6 | Moxifloxacin

Descarboxy Moxifloxacin
$99.00 25 mg
In Stock

CAS No.

: 1322062-57-6

Mol F.

: C20H24FN3O2

Mol W.

: 357.42

Cat No.

: SA30719

Deschloro Bupropion Hydrochloride | 63199-74-6 | Bupropion

,

Deschloro Bupropion Hydrochloride
$125.00 25 mg
In Stock

CAS No.

: 63199-74-6

Mol F.

: C13H20ClNO

Mol W.

: 241.76

Cat No.

: SA12218

Deschloro Empagliflozin | 2452301-27-6 | Empagliflozin

,

Deschloro Empagliflozin
$180.00 10 mg
In Stock

CAS No.

: 2452301-27-6

Mol F.

: C23H28O7

Mol W.

: 416.46

Cat No.

: SA15110

Deschloro Ertugliflozin Impurity | Ertugliflozin

,

Deschloro Ertugliflozin Impurity
Please enquire for price & pack size
In Stock

CAS No.

Mol F.

: C22H26O7

Mol W.

: 402.44

Cat No.

: SA36808

Desdifluoro Dolutegravir | 2244161-71-3 | Dolutegravir

,

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

Desethyl Azilsartan Medoxomil | 1417576-00-1 | Azilsartan

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

Desethylclomifene | 1310815-19-0 | Clomifene

,

Desethylclomifene
Please enquire for price & pack size
In Stock

CAS No.

: 1310815-19-0

Mol F.

: C24H24ClNO

Mol W.

: 377.9

Cat No.

: SA21708

Desfluoro Aniline Ezetimibe Ketone | Ezetimibe

Desfluoro Aniline Ezetimibe Ketone
$255.00 10 mg
In Stock

CAS No.

Mol F.

: C24H20FNO3

Mol W.

: 389.4

Cat No.

: SA14851

Desfluoro Benzene Ezetimibe Ketone | 163222-31-9 | Ezetimibe

Desfluoro Benzene Ezetimibe Ketone
$255.00 10 mg
In Stock

CAS No.

: 163222-31-9

Mol F.

: C24H20FNO3

Mol W.

: 389.4

Cat No.

: SA14850

Desfluoro Citalopram Oxalate | 1093072-86-6 | Citalopram

,

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

Desfluoro Ezetimibe; Ezetimibe Desfluoroaniline Analog | 302781-98-2 | Ezetimibe

Desfluoro Ezetimibe; Ezetimibe Desfluoroaniline Analog
$125.00 10 mg
In Stock

CAS No.

: 302781-98-2

Mol F.

: C24H22FNO3

Mol W.

: 391.43

Cat No.

: SA14805

Desfluoro Fosaprepitant Dimeglumine | 2975348-16-2 | Fosaprepitant

Desfluoro Fosaprepitant Dimeglumine
$255.00 10 mg
In Stock

CAS No.

: 2975348-16-2

Mol F.

: C37H56F6N6O16P

Mol W.

: 985.83

Cat No.

: SA45421

Desformyl Abaca-1; Abacavir Related Compound B | 141271-11-6 | Abacavir

,

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

Desglucosylempagliflozin 4,4’-Dimer; Empagliflozin Dimer | Empagliflozin

,

Desglucosylempagliflozin 4,4’-Dimer; Empagliflozin Dimer
$265.00 10 mg
In Stock

CAS No.

Mol F.

: C34H32Cl2O4

Mol W.

: 575.52

Cat No.

: SA15109

Desglycolaldehyde-carboxyl Desonide | 117782-94-2 | Desonide

,

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

Deshydroxy Impurity (Formoterol Fumarate) | 477552-93-5 | Formoterol

,

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

Deshydroxyethyl Fluphenazine | 2804-16-2 (Free); 4617-82-7 (HCl) | Fluphenazine

,

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 Dehydro Impurity | 117811-20-8 | Desloratadine

Desloratadine Dehydro Impurity
$155.00 10 mg
In Stock

CAS No.

: 117811-20-8

Mol F.

: C19H17ClN2

Mol W.

: 308.8

Cat No.

: SA48805

Desloratadine EP Impurity A | 298220-99-2 | Desloratadine

Desloratadine EP Impurity A
$95.00 10 mg
In Stock

CAS No.

: 298220-99-2

Mol F.

: C19H20ClFN2

Mol W.

: 330.8

Cat No.

: SA48801

Desloratadine Nitroso Impurity; N-Nitroso-Desloratadine | 1246819-22-6 | Loratadine

, ,

Desloratadine Nitroso Impurity; N-Nitroso-Desloratadine
$155.00 25 mg
In Stock

CAS No.

: 1246819-22-6

Mol F.

: C19H18ClN3O

Mol W.

: 339.82

Cat No.

: SA34034

Desmethyl Gatifloxacin | 112811-57-1 | Gatifloxacin

Desmethyl Gatifloxacin
$155.00 100 mg
In Stock

CAS No.

: 112811-57-1

Mol F.

: C18H20FN3O4

Mol W.

: 361.37

Cat No.

: SA37904

Desmethyl Impurity 4-Iodo-2,6-dimethyl | 13194-68-8 | 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

Desmethyl Nintedanib | 894783-61-0 | 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

Desmethyl Tenofovir Disoproxil; Tenofovir disoproxil fumarate Impurity P | 365417-53-4; 1798422-29-3 | Tenofovir

,

Desmethyl Tenofovir Disoproxil; Tenofovir disoproxil fumarate Impurity P
$99.00 10 mg
In Stock

CAS No.

: 365417-53-4; 1798422-29-3

Mol F.

: C18H28N5O10P

Mol W.

: 505.42

Cat No.

: SA36919

Desmethyl Venlafaxine N-Oxide | 1021933-95-8 | 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 | 638-94-8 | Desonide

,

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 21-Acetate | 25092-25-5 | Desonide

,

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 Oxidative Impurity | 75262-69-0 | Desoximetasone

,

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

Desoximrthasone-delta-9,11-analog | NA | Desoximetasone

,

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

Desoxo Palbociclib Impurity | 2204863-06-7 | Palbociclib

Desoxo Palbociclib Impurity
Please enquire for price & pack size
In Stock

CAS No.

: 2204863-06-7

Mol F.

: C24H29N7O

Mol W.

: 431.53

Cat No.

: SA40412

Desoxymetasone | 382-67-2 | Dexamethasone

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 17-Propionate Impurity | 15423-89-9 | Dexamethasone

,

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

Dexamethasone Acid | 37927-01-8 | Dexamethasone

Dexamethasone Acid
Please enquire for price & pack size
In Stock

CAS No.

: 37927-01-8

Mol F.

: C21H27FO5

Mol W.

: 378.43

Cat No.

: SA15506

Dexamethasone EP Impurity B | 378-44-9 | Dexamethasone

Dexamethasone EP Impurity B
$95.00 25 mg
In Stock

CAS No.

: 378-44-9

Mol F.

: C22H29FO5

Mol W.

: 392.46

Cat No.

: SA15519

Dexamethasone EP Impurity C | 426-17-5 | Dexamethasone

Dexamethasone EP Impurity C
$155.00 25 mg
In Stock

CAS No.

: 426-17-5

Mol F.

: C22H31FO5

Mol W.

: 394.48

Cat No.

: SA15515

Dexamethasone EP Impurity D | 24916-90-3 | Dexamethasone

,

Dexamethasone EP Impurity D
Please enquire for price & pack size
In Stock

CAS No.

: 24916-90-3

Mol F.

: C22H28O5

Mol W.

: 372.45

Cat No.

: SA15509

Dexamethasone EP Impurity E | 13209-41-1 | Dexamethasone

,

Dexamethasone EP Impurity E
$255.00 25 mg
In Stock

CAS No.

: 13209-41-1

Mol F.

: C22H28O4

Mol W.

: 356.46

Cat No.

: SA15517

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