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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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Cefaclor, Impurities

Cefaclor EP Impurity D

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Limited Stock

CAS No.

: 152575-13-8

Mol F.

: C15H14ClN3O4S

Mol W.

: 367.81

Cat No.

: SA18708

Cefaclor, Impurities

Cefaclor EP Impurity G

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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

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Limited Stock

CAS No.

: NA

Mol F.

: C36H36N6O9S2

Mol W.

: 760.84

Cat No.

: SA31918

Cefprozil, Impurities

Cefprozil EP Impurity F

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Limited Stock

CAS No.

: 107937-01-9

Mol F.

: C10H12N2O3S

Mol W.

: 240.28

Cat No.

: SA31906

Cefprozil, Impurities

Cefprozil EP Impurity H

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Limited Stock

CAS No.

: NA

Mol F.

: C26H26N4O7S

Mol W.

: 538.57000000000005

Cat No.

: SA31908

Celecoxib, Impurities

Celecoxib benzylic hydroxy impurity

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Limited Stock

CAS No.

: 1061214-09-2

Mol F.

: C17H15F3N2O3S

Mol W.

: 384.37

Cat No.

: SA11304

Celiprolol, Impurities

Celiprolol EP Impurity B

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Limited Stock

CAS No.

: 125579-40-1

Mol F.

: C31H46N4O7

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

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Limited Stock

CAS No.

: 345930-32-7

Mol F.

: C14H9ClO6S

Mol W.

: 340.74

Cat No.

: SA22400

Cinacalcet, Impurities

Cinacalcet A Impurity

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Limited Stock

CAS No.

: 3886-70-2

Mol F.

: C12H14ClN

Mol W.

: 207.7

Cat No.

: SA34207

Impurities, Loratadine

Dehydro Desloratadine

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Limited Stock

CAS No.

: 117811-20-8

Mol F.

: C19H17ClN2

Mol W.

: 308.8

Cat No.

: SA34032

Bromfenac, Impurities

Des Bromo Dione

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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

Diacerein EP Impurity H

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Limited Stock

CAS No.

: 25395-11-3

Mol F.

: C21H16O8

Mol W.

: 396.35

Cat No.

: SA11001

Exemestane, Impurities

Diepoxy Exemestane Impurity

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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

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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

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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

Hydrocortisone EP Impurity E

$185.00 25 mg

In Stock

CAS No.

: 600-99-7

Mol F.

: C₂₁H₂₈O₅

Mol W.

: 360.44

Cat No.

: SA15206

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

Hydroxyprogesterone Caproate, Impurities

Hydroxyprogesterone Caproate impurity D

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Limited Stock

CAS No.

: 4596-16-1

Mol F.

: C28H42O4

Mol W.

: 442.63

Cat No.

: SA18203

Impurities, Indacaterol

Indacaterol O-Benzyl Impurity

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Limited Stock

CAS No.

: 435273-75-9

Mol F.

: C31H34N2O3

Mol W.

: 482.61

Cat No.

: SA48705

Impurities, Levonorgestrel

Levonorgestrel EP Impurity G

Please enquire for price & pack size

Limited Stock

CAS No.

: 87585-03-3

Mol F.

: C₂₁H₂₈O₃

Mol W.

: 328.45

Cat No.

: SA23710

Impurities, Levonorgestrel

Levonorgestrel EP Impurity I

Please enquire for price & pack size

Limited Stock

CAS No.

: 20402-62-4

Mol F.

: C21H28O3

Mol W.

: 328.45

Cat No.

: SA23712

Linagliptin

Linagliptin Impurity 4

$1,555.00 100 mg

Limited Stock

CAS No.

Mol F.

: C35H36N10O2

Mol W.

: 628.73

Cat No.

: SA49937

Colesevelam, Impurities

Methoxyquat Bromide

$150.00 25 mg

Limited Stock

CAS No.

: 359436-97-8

Mol F.

: C10H24BrNO

Mol W.

: 254.21

Cat No.

: SA10210

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity G

$125.00 25 mg

Limited Stock

CAS No.

: 1625-11-2

Mol F.

: C24H34O6

Mol W.

: 418.52

Cat No.

: SA25006

Impurities, Methylprednisolone

Methylprednisolone EP Impurity B

$125.00 25 mg

Limited Stock

CAS No.

: 58636-50-3

Mol F.

: C22H30O6

Mol W.

: 390.47

Cat No.

: SA14405

Impurities, Methylprednisolone

Methylprednisolone EP Impurity F

$125.00 25 mg

Limited Stock

CAS No.

: 1625-39-4

Mol F.

: C22H32O5

Mol W.

: 376.49

Cat No.

: SA14407

Impurities, Midazolam

Midazolam EP Impurity J

Please enquire for price & pack size

Limited Stock

CAS No.

: 59469-08-8

Mol F.

: C18H17ClFN3

Mol W.

: 329.8

Cat No.

: SA44302