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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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Diethylene glycol adipate | 117197-81-6 | 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 | 2557-49-5 | Diflorasone Acetate

,

Diflorasone
$95.00 25 mg
In Stock

CAS No.

: 2557-49-5

Mol F.

: C22H28F2O5

Mol W.

: 410.45

Cat No.

: SA44400

Diflorasone 17-propionate | 924726-89-6 | Diflorasone Acetate

,

Diflorasone 17-propionate
$250.00 25 mg
In Stock

CAS No.

: 924726-89-6

Mol F.

: C25H32F2O6

Mol W.

: 466.51

Cat No.

: SA44404

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

,

Diflorasone 17-propionate-21-mesylate
$250.00 25 mg
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
$250.00 25 mg
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
$250.00 25 mg
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
$655.00 100 mg
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
$195.00 25 mg
In Stock

CAS No.

: 141509-20-8

Mol F.

: C19H22O2

Mol W.

: 282.38

Cat No.

: SA51604

Diphenhydramine N-oxide Hydrochloride | 13168-00-8 | Diphenhydramine

,

Diphenhydramine N-oxide Hydrochloride
$295.00 50 mg
In Stock

CAS No.

: 13168-00-8

Mol F.

: C17H22ClNO2

Mol W.

: 307.82

Cat No.

: SA19806

Dobutamine Dimethoxyphenethyl Impurity| CAS No.: 140165-60-2 | 140165-60-2 | Dobutamine

,

Dobutamine Dimethoxyphenethyl Impurity| CAS No.: 140165-60-2
$655.00 100 mg
In Stock

CAS No.

: 140165-60-2

Mol F.

: C20H27NO3

Mol W.

: 329.4

Cat No.

: SA65107

Dobutamine EP Impurity C | 61413-44-3 | Dobutamine

,

Dobutamine EP Impurity C
$165.00 25 mg
In Stock

CAS No.

: 61413-44-3

Mol F.

: C21H29NO3

Mol W.

: 343.5

Cat No.

: SA65103

Dolutegravir | 1051375-16-6 | Dolutegravir

,

Dolutegravir
Please enquire for price & pack size
In Stock

CAS No.

: 1051375-16-6

Mol F.

: C20H19F2N3O5

Mol W.

: 419.38

Cat No.

: SA20203

Dolutegravir Enantiomer Impurity | 1309575-43-6 | Dolutegravir

,

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

Dolutegravir enantiomer intermediate | NA | Dolutegravir

,

Dolutegravir enantiomer intermediate
Please enquire for price & pack size
In Stock

CAS No.

: NA

Mol F.

: C14H16N2O6

Mol W.

: 308.29

Cat No.

: SA20230

Dolutegravir Impurity A | 2778347-47-8 | Dolutegravir

,

Dolutegravir Impurity A
$150.00 25 mg
In Stock

CAS No.

: 2778347-47-8

Mol F.

: C22H23F2N3O5

Mol W.

: 447.43

Cat No.

: SA20231

Dolutegravir Impurity C | 1802141-49-6 | Dolutegravir

,

Dolutegravir Impurity C
$95.00 25 mg
In Stock

CAS No.

: 1802141-49-6

Mol F.

: C22H23F2N3O5

Mol W.

: 447.43

Cat No.

: SA20232

Dolutegravir isopropyl analouge | NA | Dolutegravir

,

Dolutegravir isopropyl analouge
Please enquire for price & pack size
In Stock

CAS No.

: NA

Mol F.

: C23H25F2N3O5

Mol W.

: 461.45

Cat No.

: SA20201

Dolutegravir propyl analouge | NA | Dolutegravir

,

Dolutegravir propyl analouge
Please enquire for price & pack size
In Stock

CAS No.

: NA

Mol F.

: C23H25F2N3O5

Mol W.

: 461.45

Cat No.

: SA20202

Domperidone | 57808-66-9 | Domperidone

,

Domperidone
$155.00 100 mg
In Stock

CAS No.

: 57808-66-9

Mol F.

: C22H24ClN5O2

Mol W.

: 425.91

Cat No.

: SA57400

Domperidone EP Impurity B | 1346598-11-5 | Domperidone

,

Domperidone EP Impurity B
$85.00 25 mg
In Stock

CAS No.

: 1346598-11-5

Mol F.

: C13H14ClN3O2

Mol W.

: 279.7

Cat No.

: SA57402

Domperidone N-Oxide | 118435-03-3 | Domperidone

,

Domperidone N-Oxide
$95.00 25 mg
In Stock

CAS No.

: 118435-03-3

Mol F.

: C22H24ClN5O3

Mol W.

: 441.9

Cat No.

: SA57408

Donepezil indene; Dehydrodeoxy Donepezil | 120013-45-8; 130927-68-3(HCl Salt) | Donepezil

,

Donepezil indene; Dehydrodeoxy Donepezil
$125.00 10 mg
In Stock

CAS No.

: 120013-45-8; 130927-68-3(HCl Salt)

Mol F.

: C24H29NO2

Mol W.

: 363.49

Cat No.

: SA34311

Donepezil N-Oxide | 120013-84-5 | Donepezil

,

Donepezil N-Oxide
$175.00 50 mg
In Stock

CAS No.

: 120013-84-5

Mol F.

: C24H29NO4

Mol W.

: 395.49

Cat No.

: SA34301

Doorzolamide Maleic Ester [(n-1)adduct] | Dorzolamide

,

Doorzolamide Maleic Ester [(n-1)adduct]
$495.00 25 mg
In Stock

CAS No.

Mol F.

: C18H28N2O8S3

Mol W.

: 496.63

Cat No.

: SA24107

Dorzolamide EP Impurity B | 120279-37-0 | Dorzolamide

,

Dorzolamide EP Impurity B
$350.00 25 mg
In Stock

CAS No.

: 120279-37-0

Mol F.

: C10H17ClN2O4S3

Mol W.

: 360.91

Cat No.

: SA24102

Dorzolamide EP Impurity D | 154154-90-2 (base); 164455-27-0 (HCl salt) | Dorzolamide

,

Dorzolamide EP Impurity D
$295.00 25 mg
In Stock

CAS No.

: 154154-90-2 (base); 164455-27-0 (HCl salt)

Mol F.

: C8H12N2O4S3

Mol W.

: 332.85/296.4 (Free Base)

Cat No.

: SA24104

Dorzolamide Maleic Acid Adduct | Dorzolamide

Dorzolamide Maleic Acid Adduct
$355.00 25 mg
In Stock

CAS No.

Mol F.

: C14H20N2O8S3

Mol W.

: 440.51

Cat No.

: SA24100

Dorzolamide N-Acetyl Analog | 147200-03-1 | Dorzolamide

,

Dorzolamide N-Acetyl Analog
$125.00 25 mg
In Stock

CAS No.

: 147200-03-1

Mol F.

: C10H14N2O5S3

Mol W.

: 338.42

Cat No.

: SA24101

Doxepin EP Impurity C | 4504-96-5; 2887-91-4 | Doxepin

,

Doxepin EP Impurity C
$90.00 25 mg
In Stock

CAS No.

: 4504-96-5; 2887-91-4

Mol F.

: C18H19NO

Mol W.

: 265.35

Cat No.

: SA29903

Duloxetine | 116539-59-4(freebase);136434-34-9 | Duloxetine

,

Duloxetine
$100.00 25 mg
In Stock

CAS No.

: 116539-59-4(freebase);136434-34-9

Mol F.

: C18H19NOS

Mol W.

: 297.42

Cat No.

: SA36300

Duloxetine Dimethylaminopropanol Impurity | 132335-44-5 | Duloxetine

,

Duloxetine Dimethylaminopropanol Impurity
$80.00 25 mg
In Stock

CAS No.

: 132335-44-5

Mol F.

: C9H15NOS

Mol W.

: 185.29

Cat No.

: SA36309

Duloxetine EP Impurity B | 116539-55-0 | Duloxetine

,

Duloxetine EP Impurity B
$80.00 25 mg
In Stock

CAS No.

: 116539-55-0

Mol F.

: C8H13NOS

Mol W.

: 171.26

Cat No.

: SA36302

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