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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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Dexamethasone EP Impurity G | 1177-87-3 | Dexamethasone

,

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 EP Impurity H | 10106-41-9 | Dexamethasone

,

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 EP Impurity I | 14622-47-0 | Dexamethasone

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 EP Impurity J | 2036-77-3 | Dexamethasone

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 EP Impurity K | 1809224-82-5 | Dexamethasone

Dexamethasone EP Impurity K
$500.00 5 mg
In Stock

CAS No.

: 1809224-82-5

Mol F.

: C22H26O4

Mol W.

: 354.44

Cat No.

: SA15511

Dexamethasone Ethyl Ester | 2991360-83-7 | Dexamethasone

Dexamethasone Ethyl Ester
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In Stock

CAS No.

: 2991360-83-7

Mol F.

: C23H31FO5

Mol W.

: 406.488

Cat No.

: SA15530

Dexamethasone Oxetanone | 4089-36-5 | Dexamethasone

,

Dexamethasone Oxetanone
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In Stock

CAS No.

: 4089-36-5

Mol F.

: C22H27FO4

Mol W.

: 374.44

Cat No.

: SA15516

Dexamethasone Phosphate | 312-93-6 | Dexamethasone

Dexamethasone Phosphate
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In Stock

CAS No.

: 312-93-6

Mol F.

: C22H30FO8P

Mol W.

: 472.44

Cat No.

: SA15542

Dexamethasone Phosphate EP Impurity B | 360-63-4 | Dexamethasone

Dexamethasone Phosphate EP Impurity B
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In Stock

CAS No.

: 360-63-4

Mol F.

: C22H30FO8P

Mol W.

: 472.45

Cat No.

: SA15541

Dexamethasone Sodium Phosphate EP Impurity H | 162968-22-1 | Dexamethasone

Dexamethasone Sodium Phosphate EP Impurity H
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In Stock

CAS No.

: 162968-22-1

Mol F.

: C22H32FO8P

Mol W.

: 474.46

Cat No.

: SA15543

Dexamethasone-∆17,20 21-Aldehyde | 6762-51-2 | Dexamethasone

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

Di-butynyl linagliptin/Impurity V; Linagliptin Impurity 94 | 2749409-37-6 | Linagliptin

Di-butynyl linagliptin/Impurity V; Linagliptin Impurity 94
$155.00 50 mg
In Stock

CAS No.

: 2749409-37-6

Mol F.

: C19H24N6O2

Mol W.

: 368.4

Cat No.

: SA49931

Di-decylamine hydrochloride | 2486-84-2 | Colesevelam

,

Di-decylamine hydrochloride
$70.00 25 mg
In Stock

CAS No.

: 2486-84-2

Mol F.

: C20H43N

Mol W.

: 297.56

Cat No.

: SA10206

Di-N-Boc Neomycin Impurity 2 | Neomycin

,

Di-N-Boc Neomycin Impurity 2
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In Stock

CAS No.

Mol F.

: C21H38N2O11

Mol W.

: 494.53

Cat No.

: SA51407

Diacerein EP Impurity F | 13928-72-8 | Diacerein

,

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

Diacerin EP Impurity G | 64951-96-8 | Diacerein

,

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

Diaveridine | 5355-16-8 | Trimethoprim

,

Diaveridine
$95.00 25 mg
In Stock

CAS No.

: 5355-16-8

Mol F.

: C13H16N4O2

Mol W.

: 260.29

Cat No.

: SA27115

Dibenzyl ester of desfluoro fosaprepitant | Fosaprepitant

Dibenzyl ester of desfluoro fosaprepitant
$355.00 10 mg
In Stock

CAS No.

Mol F.

: C37H35F6N4O6P

Mol W.

: 776.66

Cat No.

: SA45424

Dibenzyl ester of fosaprepitant enantiomer | Fosaprepitant

Dibenzyl ester of fosaprepitant enantiomer
$195.00 5 mg
In Stock

CAS No.

Mol F.

: C37H34F7N4O6P

Mol W.

: 794.65

Cat No.

: SA45423

Diclofenac Ethyl Ester | 15307-77-4 | Diclofenac

,

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 Glycerol Ester Impurity | 221016-39-3 | Diclofenac

,

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 Isopropyl Ester | 66370-79-4 | Diclofenac

,

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 n-butyl ester | Diclofenac

,

Diclofenac n-butyl ester
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In Stock

CAS No.

Mol F.

: C18H19Cl2NO2

Mol W.

: 352.25

Cat No.

: SA12714

Diclofenac Propylene Glycol esters: Mixture of primary and secondary | Diclofenac

,

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

Didesmethylchlorpromazine | 3763-80-2; 2095-17-2 | Chlorpromazine

,

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

Diethylene glycol adipate | 117197-81-6 | Irganox

,

Diethylene glycol adipate
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In Stock

CAS No.

: 117197-81-6

Mol F.

: C10H18O6

Mol W.

: 234.25

Cat No.

: SA11108

Diflorasone | 2557-49-5 | Diflorasone Acetate

,

Diflorasone
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In Stock

CAS No.

: 2557-49-5

Mol F.

: C22H28F2O5

Mol W.

: 410.45

Cat No.

: SA44400

Diflorasone 17-propionate-21-mesylate | 84509-92-2 | Diflorasone Acetate

,

Diflorasone 17-propionate-21-mesylate
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In Stock

CAS No.

: 84509-92-2

Mol F.

: C26H34F2O8S

Mol W.

: 544.61

Cat No.

: SA44402

Diflorasone 21-acetate | 3826-17-3 | Diflorasone Acetate

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 21-Propionate | 541502-98-1 | Diflorasone Acetate

,

Diflorasone 21-Propionate
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In Stock

CAS No.

: 541502-98-1

Mol F.

: C25H32F2O6

Mol W.

: 466.51

Cat No.

: SA44403

Difluoro Hydroxy Gatifloxacin | 154093-72-8 | Gatifloxacin

Difluoro Hydroxy Gatifloxacin
$155.00 100 mg
In Stock

CAS No.

: 154093-72-8

Mol F.

: C13H9F2NO4

Mol W.

: 281.21

Cat No.

: SA37902

Difluoroprednisolone-17, 21-Diacetate | 23641-05-6 | Difluoroprednisolone

Difluoroprednisolone-17, 21-Diacetate
$175.00 10 mg
In Stock

CAS No.

: 23641-05-6

Mol F.

: C25H30F2O7

Mol W.

: 480.5

Cat No.

: SA14205

Diflupredinate Impurity M | Difluoroprednisolone

Diflupredinate Impurity M
$195.00 10 mg
In Stock

CAS No.

Mol F.

: C19H22F2O3

Mol W.

: 336.37

Cat No.

: SA14212

Difluprednate 17-carboxylic acid | 167997-12-8 | Difluoroprednisolone

,

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

Dihydro Donepezil Impurity | 120012-04-6 | Donepezil

Dihydro Donepezil Impurity
$155.00 25 mg
In Stock

CAS No.

: 120012-04-6

Mol F.

: C24H31NO3

Mol W.

: 381.51

Cat No.

: SA34313

Dihydro Fenofibrate | 61001-99-8 | Fenofibrate

,

Dihydro Fenofibrate
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In Stock

CAS No.

: 61001-99-8

Mol F.

: C20H23ClO4

Mol W.

: 362.85

Cat No.

: SA27208

Diltiazem 3 Methyl Lactum | Diltiazem

,

Diltiazem 3 Methyl Lactum
$295.00 25 mg
In Stock

CAS No.

Mol F.

: C17H17NO3S

Mol W.

: 315.39

Cat No.

: SA19528

Diltiazem EP Impurity A; (2R-trans)-Diltiazem; Diltiazem Related Compound A | 103532-27-0 (HCl salt); 111188-71-7 (Base) | Diltiazem

Diltiazem EP Impurity A; (2R-trans)-Diltiazem; Diltiazem Related Compound A
$155.00 10 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 EP Impurity C; O-Desmethyl Diltiazem | 142926-07-6 (HCl); 84903-78-6 (Free base); 142926-07-6 (HBr); 1286126-67-7 | Diltiazem

Diltiazem EP Impurity C; O-Desmethyl Diltiazem
$155.00 10 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 EP Impurity D; N-Desmethyl Diltiazem | 130606-60-9; 86408-45-9 (Free base); 85100-17-0 | Diltiazem

Diltiazem EP Impurity D; N-Desmethyl Diltiazem
$125.00 10 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 EP Impurity F; Desacetyl Diltiazem | 42399-40-6; 75472-91-2 | Diltiazem

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 EP Impurity G; N-Desmethyl O-Desacetyl Diltiazem | 81353-09-5; 86408-40-4; 86408-44-8; 89596-19-0; 134506-04-0 | Diltiazem

Diltiazem EP Impurity G; N-Desmethyl O-Desacetyl Diltiazem
$155.00 10 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 Impurity 4 | 42399-51-9 | Diltiazem

Diltiazem Impurity 4
$295.00 50 mg
In Stock

CAS No.

: 42399-51-9

Mol F.

: C16H15NO3S

Mol W.

: 301.36

Cat No.

: SA19534

Diltiazem Impurity E; Cis (+) Hydroxy Diltiazem | 42399-49-5 | Diltiazem

,

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 Impurity SA19520 | 99109-07-6 | Diltiazem

,

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 N-Oxide | 142843-04-7 | Diltiazem

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 Sulphone-N-oxide | Diltiazem

Diltiazem Sulphone-N-oxide
$195.00 25 mg
In Stock

CAS No.

Mol F.

: C22H26N2O7S

Mol W.

: 462.52

Cat No.

: SA19530

Diltiazem Trans-(-)-Hydroxy Lactam | 132830-16-1 | Diltiazem

,

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

Dimethoxy difluoroprednisolone | Difluoroprednisolone

Dimethoxy difluoroprednisolone
$155.00 10 mg
In Stock

CAS No.

Mol F.

: C23H30F2O5

Mol W.

: 424.28

Cat No.

: SA14207

Dimethoxy Tapinarof | 141509-20-8 | 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

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