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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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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

Please enquire for price & pack size

In Stock

CAS No.

: 1051375-16-6

Mol F.

: C20H19F2N3O5

Mol W.

: 419.38

Cat No.

: SA20203

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

Dolutegravir, Impurities

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, Impurities

Dolutegravir Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 2778347-47-8

Mol F.

: C22H23F2N3O5

Mol W.

: 447.43

Cat No.

: SA20231

Dolutegravir, Impurities

Dolutegravir Impurity C

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In Stock

CAS No.

: 1802141-49-6

Mol F.

: C22H23F2N3O5

Mol W.

: 447.43

Cat No.

: SA20232

Dolutegravir, Impurities

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, Impurities

Dolutegravir propyl analouge

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C23H25F2N3O5

Mol W.

: 461.45

Cat No.

: SA20202

Dorzolamide, Impurities

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, Impurities

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, Impurities

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, Impurities

Dorzolamide Maleic Acid Adduct

$355.00 25 mg

In Stock

CAS No.

Mol F.

: C14H20N2O8S3

Mol W.

: 440.51

Cat No.

: SA24100

Dorzolamide, Impurities

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, Impurities

Doxepin EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

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

Mol F.

: C18H19NO

Mol W.

: 265.35

Cat No.

: SA29903

Duloxetine, Impurities

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, Impurities

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, Impurities

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

Duloxetine, Impurities

Duloxetine EP Impurity C

$140.00 25 mg

In Stock

CAS No.

: 953028-76-7

Mol F.

: C18H19NOS

Mol W.

: 297.42

Cat No.

: SA36303

Duloxetine, Impurities

Duloxetine EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 90-15-3

Mol F.

: C10H8O

Mol W.

: 144.17

Cat No.

: SA36304

Duloxetine, Impurities

Duloxetine EP Impurity E

$250.00 25 mg

In Stock

CAS No.

: 1033803-59-6(base);1033719-36-6(HCl)

Mol F.

: C18H19NOS

Mol W.

: 297.42

Cat No.

: SA36305

Duloxetine, Impurities

Duloxetine EP Impurity F

$200.00 25 mg

In Stock

CAS No.

: 116817-28-8

Mol F.

: C18H19NOS

Mol W.

: 297.42

Cat No.

: SA36306

Duloxetine, Impurities

Duloxetine EP Impurity G

Please enquire for price & pack size

In Stock

CAS No.

: 321-38-0

Mol F.

: C10H7F

Mol W.

: 146.16

Cat No.

: SA36307

Duloxetine, Impurities

Duloxetine N-Methyl

$80.00 25 mg

In Stock

CAS No.

: 132335-46-7(Freebase)132335-47-8(Oxalate)

Mol F.

: C19H21NOS

Mol W.

: 311.44

Cat No.

: SA36311

Duloxetine, Impurities

Duloxetine N-Methyl (R)-Isomer

$350.00 25 mg

In Stock

CAS No.

: 932013-45-1

Mol F.

: C19H21NOS

Mol W.

: 311.44

Cat No.

: SA36313

Duloxetine, Impurities

Duloxetine Phenyl Carbamate; (S)-Duloxetine Impurity A

$250.00 25 mg

In Stock

CAS No.

: 947686-09-1

Mol F.

: C‚…H‚ƒNOƒS

Mol W.

: 417.52

Cat No.

: SA36316

Dutasteride, Impurities

Dutasteride EP Impurity A

Please enquire for price & pack size

In Stock

CAS No.

: 104239-97-6

Mol F.

: C19H27NO3

Mol W.

: 317.42

Cat No.

: SA35201

Dutasteride, Impurities

Dutasteride EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 157307-36-3

Mol F.

: C21H31NO3

Mol W.

: 345.47

Cat No.

: SA35203

Edoxaban, Impurities

Edoxaban

Please enquire for price & pack size

In Stock

CAS No.

: 480449-70-5

Mol F.

: C24H30ClN7O4S

Mol W.

: 548.06

Cat No.

: SA33000

Edoxaban, Impurities

Edoxaban Boc impurity

Please enquire for price & pack size

In Stock

CAS No.

: 480452-36-6

Mol F.

: C21H30ClN5O5

Mol W.

: 467.9

Cat No.

: SA33032

Edoxaban, Impurities

Edoxaban Boc impurity 1

Please enquire for price & pack size

In Stock

CAS No.

: 365997-36-0

Mol F.

: C15H27NO7S

Mol W.

: 365.4

Cat No.

: SA33010

Edoxaban, Impurities

Edoxaban Boc impurity 2

Please enquire for price & pack size

In Stock

CAS No.

: 365997-34-8

Mol F.

: C14H24N4O4

Mol W.

: 312.37

Cat No.

: SA33011

Edoxaban, Impurities

Edoxaban Boc impurity 3

Please enquire for price & pack size

In Stock

CAS No.

: 480450-69-9

Mol F.

: C14H25N5O3

Mol W.

: 311.38

Cat No.

: SA33012

Edoxaban, Impurities

Edoxaban Bromo Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 775280-48-3

Mol F.

: C24H30BrN7O4S

Mol W.

: 592.5

Cat No.

: SA33031

Edoxaban, Impurities

Edoxaban Des-Methyl impurity | CAS : 740794-83-6

Please enquire for price & pack size

In Stock

CAS No.

: 740794-83-6

Mol F.

: C23H28ClN7O4S

Mol W.

: 534.03

Cat No.

: SA33051

Edoxaban, Impurities

Edoxaban Dipyridine Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 2568974-02-5

Mol F.

: C23H25Cl2N7O5

Mol W.

: 550.4

Cat No.

: SA33030

Edoxaban, Impurities

Edoxaban ethyl ester

Please enquire for price & pack size

In Stock

CAS No.

: 1093351-29-1

Mol F.

: C24H29ClN6O5S

Mol W.

: 549

Cat No.

: SA33047

Edoxaban, Impurities

Edoxaban Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 767625-11-6 ; 480450-86-0 (Li salt)

Mol F.

: C19H27N5O5S

Mol W.

: 437.5

Cat No.

: SA33024

Edoxaban, Impurities

Edoxaban Methyl Impurity

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C25H33ClN7O4S

Mol W.

: 690.00

Cat No.

: SA33034

Edoxaban, Impurities

Edoxaban N-Oxide

Please enquire for price & pack size

In Stock

CAS No.

: 2244103-96-4

Mol F.

: C24H30ClN7O5S

Mol W.

: 564.06

Cat No.

: SA33008