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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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Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate EP Impurity H

$195.00 25 mg

Limited Stock

CAS No.

: 1186048-34-9

Mol F.

: C28H36BrFO7

Mol W.

: 583.48

Cat No.

: SA14508

Betamethasone Valerate, Impurities

Betamethasone Valerate EP Impurity F

$395.00 25 mg

Limited Stock

CAS No.

: 16125-28-3

Mol F.

: C27H36O5

Mol W.

: 440.57

Cat No.

: SA18509

Brimonidine, Impurities

Brimonidine 2-oxo and 3-oxo (1:1) Impurity

$350.00 25 mg

Limited Stock

CAS No.

Mol F.

: C11H10BrN5O

Mol W.

: 308.13

Cat No.

: SA20702

Bromhexine, Impurities

Bromhexine EP Impurity D

Please enquire for price & pack size

Limited Stock

CAS No.

: 132004-28-5

Mol F.

: C14H21BrN2

Mol W.

: 297.23

Cat No.

: SA28404

Budesonide, Impurities

Budesonide (22S)-Isomer

$395.00 25 mg

Limited Stock

CAS No.

: 51372-28-2

Mol F.

: C25H34O6

Mol W.

: 430.53

Cat No.

: SA14114

Buspirone, Impurities

Buspirone EP Impurity G

$100.00 25 mg

Limited Stock

CAS No.

: 84746-24-7

Mol F.

: C12H14N6

Mol W.

: 242.28

Cat No.

: SA25806

Cangrelor, Impurities

Cangrelor Phosphate Impurity

$395.00 25 mg

Limited Stock

CAS No.

: 847460-53-1

Mol F.

: C₁₆H₂₃F₃N₅O₇PS₂

Mol W.

: 549.48

Cat No.

: SA29404

Carbamazepine, Impurities

Carbamazepine EP Impurity G

$95.00 25 mg

Limited Stock

CAS No.

: 59690-97-0

Mol F.

: C15H11BrN2O

Mol W.

: 315.16

Cat No.

: SA20313

Carbidopa, Impurities

Carbidopa EP Impurity I

$595.00 25 mg

Limited Stock

CAS No.

: 1246819-09-9

Mol F.

: C10H13BrN2O4

Mol W.

: 305.13

Cat No.

: SA31809

Carisoprodol, Impurities

Carisoprodol EP Impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 7148-50-7

Mol F.

: C₈H₁₄O₃

Mol W.

: 158.19

Cat No.

: SA25303

Carisoprodol, Impurities

Carisoprodol USP Related Compound A

Please enquire for price & pack size

Limited Stock

CAS No.

: 1471-56-3

Mol F.

: C₈H₁₇NO₃

Mol W.

: 175.23

Cat No.

: SA25300

Cefaclor, Impurities

Cefaclor EP Impurity D

Please enquire for price & pack size

Limited Stock

CAS No.

: 152575-13-8

Mol F.

: C15H14ClN3O4S

Mol W.

: 367.81

Cat No.

: SA18708

Cefaclor, Impurities

Cefaclor EP Impurity G

Please enquire for price & pack size

Limited Stock

CAS No.

: 67308-21-8(acid);37050-97-8(sodiumsalt)

Mol F.

: C16H17N3O4S

Mol W.

: 347.39

Cat No.

: SA18704

Cefprozil, Impurities

Cefprozil Dimer

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C36H36N6O9S2

Mol W.

: 760.84

Cat No.

: SA31918

Cefprozil, Impurities

Cefprozil EP Impurity F

Please enquire for price & pack size

Limited Stock

CAS No.

: 107937-01-9

Mol F.

: C10H12N2O3S

Mol W.

: 240.28

Cat No.

: SA31906

Cefprozil, Impurities

Cefprozil EP Impurity H

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C26H26N4O7S

Mol W.

: 538.57000000000005

Cat No.

: SA31908

Celecoxib, Impurities

Celecoxib benzylic hydroxy impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 1061214-09-2

Mol F.

: C17H15F3N2O3S

Mol W.

: 384.37

Cat No.

: SA11304

Celiprolol, Impurities

Celiprolol EP Impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 125579-40-1

Mol F.

: CƒH„†N„O‡

Mol W.

: 586.34

Cat No.

: SA38502

Chlorpromazine, Impurities

Chlorpromazine EP Impurity C

$115.00 25 mg

Limited Stock

CAS No.

: 53-60-1

Mol F.

: C17H20N2S

Mol W.

: 284.42

Cat No.

: SA21607

Chlorthalidone, Impurities

Chlorthalidone Impurity A

Please enquire for price & pack size

Limited Stock

CAS No.

: 345930-32-7

Mol F.

: C14H9ClO6S

Mol W.

: 340.74

Cat No.

: SA22400

Cinacalcet, Impurities

Cinacalcet A Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 3886-70-2

Mol F.

: C12H14ClN

Mol W.

: 207.7

Cat No.

: SA34207

Impurities, Loratadine

Dehydro Desloratadine

Please enquire for price & pack size

Limited Stock

CAS No.

: 117811-20-8

Mol F.

: C19H17ClN2

Mol W.

: 308.8

Cat No.

: SA34032

Bromfenac, Impurities

Des Bromo Dione

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C15H9NO3

Mol W.

: 251.24

Cat No.

: SA18913

Cangrelor, Impurities

Des Ribose Cangrelor Impurity

$175.00 25 mg

Limited Stock

CAS No.

: 1830294-25-1

Mol F.

: C₁₁H₁₄F₃N₅S₂

Mol W.

: 337.39

Cat No.

: SA29405

Brimonidine, Impurities

Des-imidazol Impurity; Thiourea,N-(2-aminoethyl)-N’-(5-bromo-6-quinoxalinyl)

$150.00 25 mg

Limited Stock

CAS No.

: 134892-47-0

Mol F.

: C11H12BrN5S

Mol W.

: 326.22

Cat No.

: SA20703

Bromfenac, Impurities

Desbromo Indol Bromfenac impurity; 7-Benzoyloxindole Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 51135-38-7

Mol F.

: C15H11NO2

Mol W.

: 237.25

Cat No.

: SA18901

Desoximetasone, Impurities

Desoxymetasone 21-Acetate

Please enquire for price & pack size

Limited Stock

CAS No.

: 1597-78-0

Mol F.

: C24H31FO5

Mol W.

: 418.5

Cat No.

: SA19208

Diacerein, Impurities

Diacerein EP Impurity H

Please enquire for price & pack size

Limited Stock

CAS No.

: 25395-11-3

Mol F.

: C21H16O8

Mol W.

: 396.35

Cat No.

: SA11001

Exemestane, Impurities

Diepoxy Exemestane Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C20H24O4

Mol W.

: 328.4

Cat No.

: SA19101

Difluoroprednisolone, Impurities

Difluprednate Impurity 5

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C21H24F2O4

Mol W.

: 378.4

Cat No.

: SA14214

Entacapone, Impurities

Entacapone EP Impurity C

Please enquire for price & pack size

Limited Stock

CAS No.

: 116313-85-0

Mol F.

: C7H5N05

Mol W.

: 183.12

Cat No.

: SA26903

Erlotinib, Impurities

Erlotinib Amine Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C14H20ClN3O4

Mol W.

: 329.78

Cat No.

: SA25200

Erlotinib, Impurities

Erlotinib Dimer

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C28H34N4O9

Mol W.

: 570.59

Cat No.

: SA25213

Erlotinib, Impurities

Erlotinib Impurity I

Please enquire for price & pack size

Limited Stock

CAS No.

: 183322-20-5

Mol F.

: C13H14Cl2N2O3

Mol W.

: 317.17

Cat No.

: SA25222

Ethinylestradiol, Impurities

Ethinylestra-1,3,5(10),6,8-pentaene-3,17-diol

Please enquire for price & pack size

Limited Stock

CAS No.

: 1357266-17-1

Mol F.

: C20H20O2

Mol W.

: 292.37

Cat No.

: SA13119

Ethinylestradiol, Impurities

Ethinylestradiol EP Impurity F

Please enquire for price & pack size

Limited Stock

CAS No.

: 56324-28-8

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA13103

Etoricoxib, Impurities

Etoricoxib Desmethyl Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 202409-31-2

Mol F.

: C17H13ClN2O2S

Mol W.

: 344.82

Cat No.

: SA41601

Flunisolide, Impurities

Flunisolide Related Compound A

Please enquire for price & pack size

Limited Stock

CAS No.

: 75575-02-9

Mol F.

: C23H29FO6

Mol W.

: 420.47

Cat No.

: SA47501

Fluocinonide, Impurities

Fluocinolone Acetonide EP Impurity I

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C24H28F2O6

Mol W.

: 450.47

Cat No.

: SA35409

Flurbiprofen, Impurities

Flurbiprofen EP Impurity C

Please enquire for price & pack size

Limited Stock

CAS No.

: 61466-95-3

Mol F.

: C15H13FO3

Mol W.

: 260.27

Cat No.

: SA14604

Febuxostat, Impurities

Formyl febuxostat impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 144060-62-8

Mol F.

: C₁₆H₁₇NO₄S

Mol W.

: 319.38

Cat No.

: SA32008

Glipizide, Impurities

Glipizide EP Impurity A

Please enquire for price & pack size

Limited Stock

CAS No.

: 33288-71-0

Mol F.

: C14H16N4O3S

Mol W.

: 320.37

Cat No.

: SA38601

Glyburide, Impurities

Glyburide USP Related Compound A

Please enquire for price & pack size

Limited Stock

CAS No.

: 16673-34-0

Mol F.

: C₁₆H₁₇ClN₂O₄S

Mol W.

: 368.84

Cat No.

: SA12303

Hydrocortisone, Impurities

Hydrocortisone 3-Methyl Enol Ether Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C22H32O5

Mol W.

: 376.49

Cat No.

: SA15221

Hydrocortisone Acetate, Impurities

Hydrocortisone Acetate EP Impurity G

Please enquire for price & pack size

Limited Stock

CAS No.

: 81968-66-3

Mol F.

: C25H34O7

Mol W.

: 446.53

Cat No.

: SA45701

Hydrocortisone, Impurities

Hydrocortisone EP Impurity D

$255.00 25 mg

Limited Stock

CAS No.

: 53-35-0

Mol F.

: C21H30O6

Mol W.

: 378.46

Cat No.

: SA15205

Hydrocortisone Valerate, Impurities

Hydrocortisone-21-aldehyde, 17-valerate

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C26H36O6

Mol W.

: 444.56

Cat No.

: SA27304

Hydroxychloroquine, Impurities

Hydroxychloroquine-O-Acetate

Please enquire for price & pack size

Limited Stock

CAS No.

: 47493-14-1

Mol F.

: C20H28ClN3O2

Mol W.

: 377.91

Cat No.

: SA23800

Hydroxyprogesterone Caproate, Impurities

Hydroxyprogesterone Caproate impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 630-56-8

Mol F.

: C26H38O4

Mol W.

: 414.58

Cat No.

: SA18201

Hydroxyprogesterone Caproate, Impurities

Hydroxyprogesterone Caproate impurity C

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C27H38O4

Mol W.

: 426.59

Cat No.

: SA18202