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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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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

Dexamethasone, Impurities

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, Impurities

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, Impurities

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, Impurities

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, Impurities

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

Dexamethasone, Impurities

Dexamethasone EP Impurity G

Please enquire for price & pack size

In Stock

CAS No.

: 1177-87-3

Mol F.

: C24H31FO6

Mol W.

: 434.5

Cat No.

: SA15520

Dexamethasone, Impurities

Dexamethasone EP Impurity H

Please enquire for price & pack size

In Stock

CAS No.

: 10106-41-9

Mol F.

: C24H30O5

Mol W.

: 398.49

Cat No.

: SA15521

Dexamethasone, Impurities

Dexamethasone EP Impurity I

Please enquire for price & pack size

In Stock

CAS No.

: 14622-47-0

Mol F.

: C₂₂H₂₈O₅

Mol W.

: 372.45

Cat No.

: SA15514

Dexamethasone, Impurities

Dexamethasone EP Impurity J

Please enquire for price & pack size

In Stock

CAS No.

: 2036-77-3

Mol F.

: C₂₂H₂₈O₅

Mol W.

: 372.45

Cat No.

: SA15510

Dexamethasone, Impurities

Dexamethasone ethyl ester

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C22H29FO5

Mol W.

: 406.488

Cat No.

: SA15530

Dexamethasone, Impurities

Dexamethasone Oxetanone

Please enquire for price & pack size

In Stock

CAS No.

: 4089-36-5

Mol F.

: C22H27FO4

Mol W.

: 374.44

Cat No.

: SA15516

Dexamethasone, Impurities

Dexamethasone-∆17,20 21-Aldehyde

$295.00 25 mg

In Stock

CAS No.

: 6762-51-2

Mol F.

: C₂₂H₂₇FO₄

Mol W.

: 374.45

Cat No.

: SA15504

Impurities, Linagliptin

Di-butynyl linagliptin/Impurity V

Please enquire for price & pack size

In Stock

CAS No.

: 2749409-37-6

Mol F.

: C19H24N6O2

Mol W.

: 368.4

Cat No.

: SA49931

Colesevelam, Impurities

Di-decylamine hydrochloride

$70.00 25 mg

In Stock

CAS No.

: 2486-84-2

Mol F.

: C20H43N

Mol W.

: 297.56

Cat No.

: SA10206

Diacerein, Impurities

Diacerein EP Impurity F

Please enquire for price & pack size

In Stock

CAS No.

: 13928-72-8

Mol F.

: C35H36O16

Mol W.

: 712.65

Cat No.

: SA11002

Diacerein, Impurities

Diacerin EP Impurity G

Please enquire for price & pack size

In Stock

CAS No.

: 64951-96-8

Mol F.

: C37H38O17

Mol W.

: 754.69

Cat No.

: SA11003

Impurities, Trimethoprim

Diaveridine

$95.00 25 mg

In Stock

CAS No.

: 5355-16-8

Mol F.

: C13H16N4O2

Mol W.

: 260.29

Cat No.

: SA27115

Fosaprepitant, Impurities

Dibenzyl ester of desfluoro fosaprepitant

$750.00 25 mg

In Stock

CAS No.

Mol F.

: C37H35F6N4O6P

Mol W.

: 776.66

Cat No.

: SA45424

Fosaprepitant, Impurities

Dibenzyl ester of fosaprepitant enantiomer

$850.00 25 mg

In Stock

CAS No.

Mol F.

: C37H34F7N4O6P

Mol W.

: 794.65

Cat No.

: SA45423

Diclofenac, Impurities

Diclofenac Ethyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 15307-77-4

Mol F.

: C16H15Cl2NO2

Mol W.

: 324.20

Cat No.

: SA12702

Diclofenac, Impurities

Diclofenac Glycerol Ester Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 221016-39-3

Mol F.

: C17H17Cl2NO4

Mol W.

: 370.22

Cat No.

: SA12715

Diclofenac, Impurities

Diclofenac Isopropyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 66370-79-4

Mol F.

: C17H17Cl2NO2

Mol W.

: 338.23

Cat No.

: SA12703

Diclofenac, Impurities

Diclofenac n-butyl ester

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C18H19Cl2NO2

Mol W.

: 352.25

Cat No.

: SA12714

Diclofenac

Diclofenac Propylene Glycol esters: Mixture of primary and secondary

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C17H17Cl2NO3

Mol W.

: 354.22

Cat No.

: SA12713

Chlorpromazine, Impurities

Didesmethylchlorpromazine

$155.00 25 mg

In Stock

CAS No.

: 3763-80-2; 2095-17-2

Mol F.

: C15H15ClN2S

Mol W.

: 290.81

Cat No.

: SA21613

Impurities, Irganox

Diethylene glycol adipate

Please enquire for price & pack size

In Stock

CAS No.

: 117197-81-6

Mol F.

: C10H18O6

Mol W.

: 234.25

Cat No.

: SA11108

Diflorasone Acetate, Impurities

Diflorasone

Please enquire for price & pack size

In Stock

CAS No.

: 2557-49-5

Mol F.

: C22H28F2O5

Mol W.

: 410.45

Cat No.

: SA44400

Diflorasone Acetate, Impurities

Diflorasone 17-propionate-21-mesylate

Please enquire for price & pack size

In Stock

CAS No.

: 84509-92-2

Mol F.

: C26H34F2O8S

Mol W.

: 544.61

Cat No.

: SA44402

Diflorasone Acetate, Impurities

Diflorasone 21-acetate

Please enquire for price & pack size

In Stock

CAS No.

: 3826-17-3

Mol F.

: C24H30F2O6

Mol W.

: 452.49

Cat No.

: SA44401

Diflorasone Acetate, Impurities

Diflorasone 21-Propionate

Please enquire for price & pack size

In Stock

CAS No.

: 541502-98-1

Mol F.

: C25H32F2O6

Mol W.

: 466.51

Cat No.

: SA44403

Gatifloxacin, Impurities

Difluoro Hydroxy Gatifloxacin

Please enquire for price & pack size

In Stock

CAS No.

: 154093-72-8

Mol F.

: C13H9F2NO4

Mol W.

: 281.21

Cat No.

: SA37902

Difluoroprednisolone, Impurities

Difluoroprednisolone-17, 21-Diacetate

$275.00 25 mg

In Stock

CAS No.

: 23641-05-6

Mol F.

: C25H30F2O7

Mol W.

: 480.5

Cat No.

: SA14205

Difluoroprednisolone, Impurities

Diflupredinate Impurity M

$195.00 10 mg

In Stock

CAS No.

Mol F.

: C19H22F2O3

Mol W.

: 336.37

Cat No.

: SA14212

Difluoroprednisolone, Impurities

Difluprednate 17-carboxylic acid

$175.00 10 mg

In Stock

CAS No.

: 167997-12-8

Mol F.

: C20H24F2O4

Mol W.

: 366.4

Cat No.

: SA14210

Fenofibrate, Impurities

Dihydro Fenofibrate

Please enquire for price & pack size

In Stock

CAS No.

: 61001-99-8

Mol F.

: C20H23ClO4

Mol W.

: 362.85

Cat No.

: SA27208

Diltiazem, Impurities

Diltiazem 3 Methyl Lactum

$295.00 25 mg

In Stock

CAS No.

Mol F.

: C17H17NO3S

Mol W.

: 315.39

Cat No.

: SA19528

Diltiazem

Diltiazem EP Impurity A

$255.00 25 mg

In Stock

CAS No.

: 103532-27-0 (HCl salt); 111188-71-7 (Base)

Mol F.

: C22H26N2O4S

Mol W.

: 414.52

Cat No.

: SA19529

Diltiazem, Impurities

Diltiazem EP Impurity C; O-Desmethyl Diltiazem

$255.00 25 mg

In Stock

CAS No.

: 142926-07-6 (HCl); 84903-78-6 (Free base); 142926-07-6 (HBr); 1286126-67-7

Mol F.

: C21H24N2O4S

Mol W.

: 400.49

Cat No.

: SA19501