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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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Cefprozil, Impurities

Cefprozil EP Impurity N

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CAS No.

: 1605314-85-9

Mol F.

: C21H23N3O7S

Mol W.

: 461.49

Cat No.

: SA31914

Ceftazidime

Ceftazidime EP Impurity A

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CAS No.

: 1000980-60-8

Mol F.

: C22H22N6O7S2

Mol W.

: 546.6

Cat No.

: SA58600

Ceftazidime

Ceftazidime EP Impurity B

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CAS No.

: 97148-38-4

Mol F.

: C22H22N6O7S2

Mol W.

: 546.6

Cat No.

: SA58601

Ceftazidime

Ceftazidime EP Impurity C

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CAS No.

: 3432-88-0

Mol F.

: C13H13N3O3S

Mol W.

: 291.3

Cat No.

: SA58603

Ceftazidime

Ceftazidime EP Impurity E

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CAS No.

: 102772-66-7

Mol F.

: C26H30N6O7S2

Mol W.

: 602.7

Cat No.

: SA58604

Ceftazidime

Ceftazidime EP Impurity G

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CAS No.

: 194241-83-3

Mol F.

: C11H14N4O5S

Mol W.

: 314.3

Cat No.

: SA58602

Ceftazidime

Ceftazidime EP Impurity H

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CAS No.

: 1354396-23-8

Mol F.

: C23H24N6O7S2

Mol W.

: 560.6

Cat No.

: SA58605

Ceftriaxone

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CAS No.

: 73384-59-5

Mol F.

: C18H18N8O7S3

Mol W.

: 554.6

Cat No.

: SA59400

Ceftriaxone

Ceftriaxone 3-Ene Isomer (USP)

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CAS No.

: NA

Mol F.

: C18H18N8O7S3

Mol W.

: 554.6

Cat No.

: SA59406

Ceftriaxone

Ceftriaxone EP Impurity A

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CAS No.

: 92143-31-2

Mol F.

: C18H18N8O7S3

Mol W.

: 554.6

Cat No.

: SA59401

Ceftriaxone

Ceftriaxone EP Impurity B

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CAS No.

: 66340-33-8

Mol F.

: C14H13N5O5S2

Mol W.

: 395.4

Cat No.

: SA59402

Ceftriaxone

Ceftriaxone EP Impurity C

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CAS No.

: 58909-39-0

Mol F.

: C4H5N3O2S

Mol W.

: 159.2

Cat No.

: SA59403

Ceftriaxone

Ceftriaxone EP Impurity D

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CAS No.

: 80756-85-0

Mol F.

: C13H10N4O2S3

Mol W.

: 350.4

Cat No.

: SA59404

Ceftriaxone

Ceftriaxone EP Impurity E

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CAS No.

: 58909-56-1

Mol F.

: C12H13N5O5S2

Mol W.

: 371.4

Cat No.

: SA59405

Cefuroxime

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CAS No.

: 55268-75-2

Mol F.

: C16H16N4O8S

Mol W.

: 424.4

Cat No.

: SA59500

Cefuroxime

Cefuroxime Axetil Anti isomer

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CAS No.

: 97232-96-7

Mol F.

: C20H22N4O10S

Mol W.

: 510.47

Cat No.

: SA59506

Cefuroxime

Cefuroxime Axetil Delta-3-Isomers

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CAS No.

: 123458-61-7

Mol F.

: C20H22N4O10S

Mol W.

: 510.5

Cat No.

: SA59505

Cefuroxime

Cefuroxime EP Impurity A

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CAS No.

: 56271-94-4

Mol F.

: C15H15N3O7S

Mol W.

: 381.4

Cat No.

: SA59501

Cefuroxime

Cefuroxime EP Impurity B

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CAS No.

: 39685-31-9

Mol F.

: C17H17N3O8S

Mol W.

: 423.4

Cat No.

: SA59502

Cefuroxime

Cefuroxime EP Impurity E

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CAS No.

: 97232-97-8

Mol F.

: C16H16N4O8S

Mol W.

: 424.4

Cat No.

: SA59503

Cefuroxime

Cefuroxime EP Impurity H

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CAS No.

: 947723-87-7

Mol F.

: C15H13N3O6S

Mol W.

: 363.3

Cat No.

: SA59504

Celecoxib, Impurities

Celecoxib

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CAS No.

: 169590-42-5

Mol F.

: C₁₇H₁₄F₃N₃O₂S

Mol W.

: 381.37

Cat No.

: SA11300

Celecoxib, Impurities

Celecoxib Carboxylic Acid

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CAS No.

: 170571-01-4

Mol F.

: C₁₇H₁₂F₃N₃O₄S

Mol W.

: 411.36

Cat No.

: SA11307

Celecoxib

Celecoxib EP Impurity B

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CAS No.

: 331943-04-5

Mol F.

: C17H14F3N3O2S

Mol W.

: 381.37

Cat No.

: SA11306

Celecoxib

Celecoxib Hydrazino Sulfonamide Impurity

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CAS No.

: 4392-54-5

Mol F.

: C6H9N3O2S

Mol W.

: 187.22

Cat No.

: SA11312

Celecoxib, Impurities

Celecoxib Methyl Ester

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CAS No.

: 1189893-75-1

Mol F.

: C₁₈H₁₄F₃N₃O₄S

Mol W.

: 425.38

Cat No.

: SA11308

Celiprolol, Impurities

Celiprolol

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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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CAS No.

: 56980-94-0

Mol F.

: C15H24N2O3

Mol W.

: 280.36

Cat No.

: SA38501

Celiprolol, Impurities

Celiprolol EP Impurity D

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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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CAS No.

: NA

Mol F.

: C36H55N5O8

Mol W.

: 685.85

Cat No.

: SA38505

Celiprolol, Impurities

Celiprolol EP Impurity F

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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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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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CAS No.

: 85045-98-3

Mol F.

: C16H23BrN2O4

Mol W.

: 387.27

Cat No.

: SA38508

Celiprolol, Impurities

Celiprolol EP Impurity I

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CAS No.

: NA

Mol F.

: C15H22N2O3

Mol W.

: 278.35

Cat No.

: SA38509

Cephalexin, Impurities

Cephalexin Diketopiperazine

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CAS No.

: 59865-11-1

Mol F.

: C16H17N3O4S

Mol W.

: 347.39

Cat No.

: SA12006

Cephalexin, Impurities

Cephalexin Ethyl homolog

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CAS No.

Mol F.

: C17H19N3O4S

Mol W.

: 361.42

Cat No.

: SA12013

Cetirizine, Impurities

Cetirizine (1-Methyl)-Methylene Dimer Impurity

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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

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CAS No.

Mol F.

: C₂₇H₃₅ClN₂O₅

Mol W.

: 503.03

Cat No.

: SA13508

Cetirizine, Impurities

Cetirizine Allyl Ester Dihydrochloride

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CAS No.

Mol F.

: C₂₄H₃₁Cl₃N₂O₃

Mol W.

: 501.87

Cat No.

: SA13507

Cetirizine, Impurities

Cetirizine Dihydrochloride

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CAS No.

: 83881-52-1

Mol F.

: C21H27Cl3N2O3

Mol W.

: 461.81

Cat No.

: SA13500

Cetirizine

Cetirizine EP Impurity E

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CAS No.

: 682323-77-9

Mol F.

: C23H29ClN2O4

Mol W.

: 432.9

Cat No.

: SA13520

Cetirizine

Cetirizine EP Impurity F

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CAS No.

: 83881-53-2

Mol F.

: C21H26N2O3

Mol W.

: 354.44

Cat No.

: SA13521

Cetirizine, Impurities

Cetirizine Glycerol Ester Dihydrochloride (Mixture of Diastereomers)

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CAS No.

Mol F.

: C₂₄H₃₃Cl₃N₂O₅

Mol W.

: 535.89

Cat No.

: SA13506

Cetirizine, Impurities

Cetirizine Glycol Ester Dihydrochloride

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CAS No.

Mol F.

: C₂₄H₃₁ClN₂O₄

Mol W.

: 446.97

Cat No.

: SA13504

Cetirizine

Cetirizine Lactose Ester

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CAS No.

: NA

Mol F.

: C33H45ClN2O13

Mol W.

: 713.17

Cat No.

: SA13522

Cetirizine, Impurities

Cetirizine N-(2-Ethoxyacetate)

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CAS No.

Mol F.

: C₂₅H₃₁ClN₂O₆

Mol W.

: 490.98

Cat No.

: SA13505

Cetirizine

Cetirizine S-Isomer

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CAS No.

: 130018-76-7; 130018-89-2 (HCl salt)

Mol F.

: C21H25ClN2O3

Mol W.

: 388.89

Cat No.

: SA13523

Cevimeline

Cevimeline Sulphoxide (RRR and SSS)

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CAS No.

: 124751-37-7

Mol F.

: C10H17NO2S

Mol W.

: 215.31

Cat No.

: SA79900

Chlorhexidine

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CAS No.

: 55-56-1

Mol F.

: C22H30Cl2N10

Mol W.

: 505.5

Cat No.

: SA59600

Chlorhexidine

Chlorhexidine EP Impurity A

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CAS No.

: 152504-08-0

Mol F.

: C16H24ClN9

Mol W.

: 377.9

Cat No.

: SA59601