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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Cefadroxil, Impurities

Cefadroxil Monohydrate

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Out of Stock

CAS No.

: 66592-87-8

Mol F.

: C16H19N3O6S

Mol W.

: 381.4

Cat No.

: SA42300

Cephalexin, Impurities

Cefalexin EP Impurity G; Isocefalexine

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Out of Stock

CAS No.

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

Mol F.

: C16H17N3O4S

Mol W.

: 347.39

Cat No.

: SA12016

Cephalexin, Impurities

Cefalexin Monohydrate

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Out of Stock

CAS No.

: 15686-71-2 (anhydrous); 23325-78-2 (monohydrate)

Mol F.

: C16H19N3O5S

Mol W.

: 365.4

Cat No.

: SA12015

Cefprozil, Impurities

Cefprozil

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Out of Stock

CAS No.

: 92665-29-7

Mol F.

: C18H19N3O5S

Mol W.

: 389.43

Cat No.

: SA31900

Cefprozil, Impurities

Cefprozil EP Impurity B

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Out of Stock

CAS No.

: 66592-87-8

Mol F.

: C16H17N3O5S.H2O

Mol W.

: 381.4

Cat No.

: SA31902

Cefprozil, Impurities

Cefprozil EP Impurity C

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Out of Stock

CAS No.

: 147103-93-3

Mol F.

: C11H11N3O3

Mol W.

: 233.22

Cat No.

: SA31903

Cefprozil, Impurities

Cefprozil EP Impurity E

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Out of Stock

CAS No.

: NA

Mol F.

: C26H26N4O7S

Mol W.

: 538.57000000000005

Cat No.

: SA31905

Cefprozil, Impurities

Cefprozil EP Impurity G

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Out of Stock

CAS No.

: NA

Mol F.

: C18H21N3O6S

Mol W.

: 407.44

Cat No.

: SA31907

Cefprozil, Impurities

Cefprozil EP Impurity I

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Out of Stock

CAS No.

: NA

Mol F.

: C18H21N3O6S

Mol W.

: 407.44

Cat No.

: SA31909

Cefprozil, Impurities

Cefprozil EP Impurity J

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Out of Stock

CAS No.

Mol F.

: C26H26N4O7S

Mol W.

: 538.57

Cat No.

: SA31910

Cefprozil, Impurities

Cefprozil EP Impurity K

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Out of Stock

CAS No.

: NA

Mol F.

: C18H19N3O5S

Mol W.

: 389.43

Cat No.

: SA31911

Cefprozil, Impurities

Cefprozil EP Impurity L

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Out of Stock

CAS No.

: 203007-73-2

Mol F.

: C10H13NO4

Mol W.

: 211.21

Cat No.

: SA31912

Cefprozil, Impurities

Cefprozil EP Impurity N

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Out of Stock

CAS No.

: 1605314-85-9

Mol F.

: C21H23N3O7S

Mol W.

: 461.49

Cat No.

: SA31914

Celecoxib, Impurities

Celecoxib

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Out of Stock

CAS No.

: 169590-42-5

Mol F.

: C₁₇H₁₄F₃N₃O₂S

Mol W.

: 381.37

Cat No.

: SA11300

Celecoxib, Impurities

Celecoxib Carboxylic Acid

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Out of Stock

CAS No.

: 170571-01-4

Mol F.

: C₁₇H₁₂F₃N₃O₄S

Mol W.

: 411.36

Cat No.

: SA11307

Celecoxib, Impurities

Celecoxib EP Impurity B

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Out of Stock

CAS No.

: 331943-04-5

Mol F.

: C17H14F3N3O2S

Mol W.

: 381.37

Cat No.

: SA11306

Celecoxib, Impurities

Celecoxib Methyl Ester

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Out of Stock

CAS No.

: 1189893-75-1

Mol F.

: C₁₈H₁₄F₃N₃O₄S

Mol W.

: 425.38

Cat No.

: SA11308

Celiprolol, Impurities

Celiprolol

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Out of Stock

CAS No.

: 56980-93-6 (Free Base); 57470-78-7 (HCl salt)

Mol F.

: C20H34ClN3O4

Mol W.

: 379.49

Cat No.

: SA38500

Celiprolol, Impurities

Celiprolol EP Impurity A

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Out of Stock

CAS No.

: 56980-94-0

Mol F.

: C…H‚„N‚Oƒ

Mol W.

: 280.36

Cat No.

: SA38501

Celiprolol, Impurities

Celiprolol EP Impurity D

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Out of Stock

CAS No.

: 56980-93-9

Mol F.

: C20H33N3O4

Mol W.

: 379.49

Cat No.

: SA38504

Celiprolol, Impurities

Celiprolol EP Impurity E

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Out of Stock

CAS No.

: NA

Mol F.

: C36H55N5O8

Mol W.

: 685.85

Cat No.

: SA38505

Celiprolol, Impurities

Celiprolol EP Impurity F

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Out of Stock

CAS No.

: 79881-89-3

Mol F.

: C13H18N2O3

Mol W.

: 250.29

Cat No.

: SA38506

Celiprolol, Impurities

Celiprolol EP Impurity G

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Out of Stock

CAS No.

: 56980-98-4

Mol F.

: C16H22N2O4

Mol W.

: 306.36

Cat No.

: SA38507

Celiprolol, Impurities

Celiprolol EP Impurity H

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Out of Stock

CAS No.

: 85045-98-3

Mol F.

: C†H‚ƒBrN‚O„

Mol W.

: 387.27

Cat No.

: SA38508

Celiprolol, Impurities

Celiprolol EP Impurity I

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Out of Stock

CAS No.

: NA

Mol F.

: C15H22N2O3

Mol W.

: 278.35

Cat No.

: SA38509

Cephalexin, Impurities

Cephalexin Diketopiperazine

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Out of Stock

CAS No.

: 59865-11-1

Mol F.

: C16H17N3O4S

Mol W.

: 347.39

Cat No.

: SA12006

Cephalexin, Impurities

Cephalexin Ethyl homolog

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C17H19N3O4S

Mol W.

: 361.42

Cat No.

: SA12013

Cetirizine, Impurities

Cetirizine (1-Methyl)-Methylene Dimer Impurity

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Out of Stock

CAS No.

Mol F.

: C40H48Cl2N4O2

Mol W.

: 687.74

Cat No.

: SA13516

Cetirizine, Impurities

Cetirizine (2,2-Dimethyl-1,3-dioxolan-4-yl)methyl ester

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C₂₇H₃₅ClN₂O₅

Mol W.

: 503.03

Cat No.

: SA13508

Cetirizine, Impurities

Cetirizine Allyl Ester Dihydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C₂₄H₃₁Cl₃N₂O₃

Mol W.

: 501.87

Cat No.

: SA13507

Cetirizine, Impurities

Cetirizine Amide

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Out of Stock

CAS No.

: 83881-37-2

Mol F.

: C₂₁H₂₆ClN₃O₂

Mol W.

: 387.9

Cat No.

: SA13510

Cetirizine, Impurities

Cetirizine Dihydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 83881-52-1

Mol F.

: C21H27Cl3N2O3

Mol W.

: 461.81

Cat No.

: SA13500

Impurities, Nitrosamine

Cetirizine dihydrochloride (nitrosamine of imp A) nitrosamine impurity

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Out of Stock

CAS No.

: NA

Mol F.

: C17H18ClN3O

Mol W.

: 315.8

Cat No.

: SA44610

Cetirizine, Impurities

Cetirizine Ethyl Ester

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Out of Stock

CAS No.

: 246870-46-2

Mol F.

: C₂₃H₂₉ClN₂O₃

Mol W.

: 416.94

Cat No.

: SA13511

Cetirizine, Impurities

Cetirizine Glycerol Ester Dihydrochloride (Mixture of Diastereomers)

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Out of Stock

CAS No.

Mol F.

: C₂₄H₃₃Cl₃N₂O₅

Mol W.

: 535.89

Cat No.

: SA13506

Cetirizine, Impurities

Cetirizine Glycol Ester Dihydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C₂₄H₃₁ClN₂O₄

Mol W.

: 446.97

Cat No.

: SA13504

Cetirizine, Impurities

Cetirizine N-(2-Ethoxyacetate)

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Out of Stock

CAS No.

Mol F.

: C₂₅H₃₁ClN₂O₆

Mol W.

: 490.98

Cat No.

: SA13505

Cetirizine, Impurities

Cetirizine N-Methyl Piperazine Impurity

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Out of Stock

CAS No.

Mol F.

: C18H21ClN2

Mol W.

: 300.83

Cat No.

: SA13515

Cetirizine, Impurities

Cetrizine N-Oxide

Please enquire for price & pack size

Out of Stock

CAS No.

: 1076199-80-8

Mol F.

: C21H25ClN2O4

Mol W.

: 404.89

Cat No.

: SA13503

Efavirenz, Impurities

Chloro Cyclopropyl Efavirenz

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Out of Stock

CAS No.

: 1322625-98-8

Mol F.

: C₁₄H₈Cl₂F₃NO₂

Mol W.

: 350.12

Cat No.

: SA17617

Aciclovir, Impurities

Chloroacetic Acid

Please enquire for price & pack size

Out of Stock

CAS No.

: 79-11-8

Mol F.

: C2H3ClO0

Mol W.

: 94.05

Cat No.

: SA21400

Diphenhydramine, Impurities

Chlorodiphenylmethane

Please enquire for price & pack size

Out of Stock

CAS No.

: 90-99-3

Mol F.

: C13H11Cl

Mol W.

: 202.68

Cat No.

: SA19805

Impurities, Tenofovir

Chloromethyl Isopropyl Carbonate

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Out of Stock

CAS No.

: 35180-01-9

Mol F.

: C5H9ClO3

Mol W.

: 152.58000000000001

Cat No.

: SA36922

Apixaban, Impurities

Chloropentanamide Apixaban Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 1449510-64-8

Mol F.

: C25H26ClN5O4

Mol W.

: 495.96

Cat No.

: SA39916

Baclofen, Impurities

Chlorophenyl glutaric Acid

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Out of Stock

CAS No.

: 35271-74-0

Mol F.

: C11H11ClO4

Mol W.

: 242.65

Cat No.

: SA28104

Hydroxychloroquine, Impurities

Chloroquine related compound A

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Out of Stock

CAS No.

: 86-98-6

Mol F.

: C9H5Cl2N

Mol W.

: 198.05

Cat No.

: SA23804

Clomifene, Impurities

Chlorostilbene

Please enquire for price & pack size

Out of Stock

CAS No.

: 948-99-2

Mol F.

: C14H11Cl

Mol W.

: 214.69

Cat No.

: SA21706

Chlorpheniramine, Impurities

Chlorphenamine; Chlorpheniramine

Please enquire for price & pack size

Out of Stock

CAS No.

: 132-22-9

Mol F.

: C16H19ClN2

Mol W.

: 274.79

Cat No.

: SA37600

Chlorpheniramine, Impurities

Chlorpheniramine Didesmethyl Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 23052-94-0

Mol F.

: C14H15ClN2

Mol W.

: 246.73

Cat No.

: SA37601

Chlorpheniramine, Impurities

Chlorpheniramine N-Oxide Dihydrochloride Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 120244-82-8 (HCl); 120244-82-8 (base)

Mol F.

: C16H19ClN2O

Mol W.

: 290.79

Cat No.

: SA37603