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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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Dexamethasone, Impurities

Dexamethasone Acid

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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

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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

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In Stock

CAS No.

: 1177-87-3

Mol F.

: C24H31FO6

Mol W.

: 434.5

Cat No.

: SA15520

Dexamethasone, Impurities

Dexamethasone EP Impurity H

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In Stock

CAS No.

: 10106-41-9

Mol F.

: C24H30O5

Mol W.

: 398.49

Cat No.

: SA15521

Dexamethasone, Impurities

Dexamethasone EP Impurity I

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In Stock

CAS No.

: 14622-47-0

Mol F.

: C₂₂H₂₈O₅

Mol W.

: 372.45

Cat No.

: SA15514

Dexamethasone, Impurities

Dexamethasone EP Impurity J

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In Stock

CAS No.

: 2036-77-3

Mol F.

: C₂₂H₂₈O₅

Mol W.

: 372.45

Cat No.

: SA15510

Dexamethasone, Impurities

Dexamethasone ethyl ester

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In Stock

CAS No.

Mol F.

: C22H29FO5

Mol W.

: 406.488

Cat No.

: SA15530

Dexamethasone, Impurities

Dexamethasone Oxetanone

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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

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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

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In Stock

CAS No.

: 13928-72-8

Mol F.

: C35H36O16

Mol W.

: 712.65

Cat No.

: SA11002

Diacerein, Impurities

Diacerin EP Impurity G

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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

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In Stock

CAS No.

: 15307-77-4

Mol F.

: C16H15Cl2NO2

Mol W.

: 324.20

Cat No.

: SA12702

Diclofenac, Impurities

Diclofenac Glycerol Ester Impurity

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In Stock

CAS No.

: 221016-39-3

Mol F.

: C17H17Cl2NO4

Mol W.

: 370.22

Cat No.

: SA12715

Diclofenac, Impurities

Diclofenac Isopropyl Ester

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In Stock

CAS No.

: 66370-79-4

Mol F.

: C17H17Cl2NO2

Mol W.

: 338.23

Cat No.

: SA12703

Diclofenac, Impurities

Diclofenac n-butyl ester

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In Stock

CAS No.

Mol F.

: C18H19Cl2NO2

Mol W.

: 352.25

Cat No.

: SA12714

Diclofenac, Impurities

Diclofenac Propylene Glycol esters: Mixture of primary and secondary

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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

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In Stock

CAS No.

: 2557-49-5

Mol F.

: C22H28F2O5

Mol W.

: 410.45

Cat No.

: SA44400

Diflorasone Acetate, Impurities

Diflorasone 21-acetate

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In Stock

CAS No.

: 3826-17-3

Mol F.

: C24H30F2O6

Mol W.

: 452.49

Cat No.

: SA44401

Diflorasone Acetate, Impurities

Diflorasone 21-Propionate

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In Stock

CAS No.

: 541502-98-1

Mol F.

: C25H32F2O6

Mol W.

: 466.51

Cat No.

: SA44403

Gatifloxacin, Impurities

Difluoro Hydroxy Gatifloxacin

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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

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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, Impurities

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

Diltiazem, Impurities

Diltiazem EP Impurity D; N-Desmethyl Diltiazem

$195.00 25 mg

In Stock

CAS No.

: 130606-60-9; 86408-45-9 (Free base); 85100-17-0

Mol F.

: C21H25ClN2O4S

Mol W.

: 436.95

Cat No.

: SA19502

Diltiazem, Impurities

Diltiazem EP Impurity F; Desacetyl Diltiazem

$95.00 25 mg

In Stock

CAS No.

: 42399-40-6; 75472-91-2

Mol F.

: C20H24N2O3S

Mol W.

: 372.48

Cat No.

: SA19505

Diltiazem, Impurities

Diltiazem EP Impurity G; N-Desmethyl O-Desacetyl Diltiazem

$255.00 25 mg

In Stock

CAS No.

: 81353-09-5; 86408-40-4; 86408-44-8; 89596-19-0; 134506-04-0

Mol F.

: C19H22N2O3S

Mol W.

: 358.45

Cat No.

: SA19525

Diltiazem, Impurities

Diltiazem Impurity 4

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In Stock

CAS No.

: 42399-51-9

Mol F.

: C16H15NO3S

Mol W.

: 301.36

Cat No.

: SA19534

Diltiazem, Impurities

Diltiazem Impurity E; Cis (+) Hydroxy Diltiazem

$79.00 25 mg

In Stock

CAS No.

: 42399-49-5

Mol F.

: C16H15NO3S

Mol W.

: 301.36

Cat No.

: SA19507

Diltiazem, Impurities

Diltiazem Impurity SA19520

$395.00 25 mg

In Stock

CAS No.

: 99109-07-6

Mol F.

: C17H19NO4S

Mol W.

: 333.4

Cat No.

: SA19520

Diltiazem, Impurities

Diltiazem N-Oxide

$195.00 25 mg

In Stock

CAS No.

: 142843-04-7

Mol F.

: C22H26N2O5S

Mol W.

: 430.52

Cat No.

: SA19510

Diltiazem, Impurities

Diltiazem Sulfone N-Oxide; Diltiazem Sulphone-N-oxide

$195.00 25 mg

In Stock

CAS No.

Mol F.

: C22H26N2O7S

Mol W.

: 462.52

Cat No.

: SA19530

Diltiazem, Impurities

Diltiazem Trans-(-)-Hydroxy Lactam

$1,195.00 25 mg

In Stock

CAS No.

: 132830-16-1

Mol F.

: C16H15NO3S

Mol W.

: 301.36

Cat No.

: SA19527

Difluoroprednisolone, Impurities

Dimethoxy difluoroprednisolone

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C23H30F2O5

Mol W.

: 424.28

Cat No.

: SA14207

Impurities, Tapinarof

Dimethoxy Tapinarof

Please enquire for price & pack size

In Stock

CAS No.

: 141509-20-8

Mol F.

: C19H22O2

Mol W.

: 282.38

Cat No.

: SA51604

Diphenhydramine, Impurities

Diphenhydramine N-oxide Hydrochloride

Please enquire for price & pack size

In Stock

CAS No.

: 13168-00-8

Mol F.

: C17H22ClNO2

Mol W.

: 307.82

Cat No.

: SA19806

Dolutegravir, Impurities

Dolutegravir Enantiomer Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1309575-43-6

Mol F.

: C20H18F2N3NaO5

Mol W.

: 441.37

Cat No.

: SA20229