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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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Clomifene, Impurities

Clomifene EP Impurity A

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CAS No.

: 19957-52-9 (Base free); 97800-41-4 (HCl salt)

Mol F.

: C26H29NO

Mol W.

: 371.51

Cat No.

: SA21702

Clomifene, Impurities

Clomifene EP Impurity B

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CAS No.

: 796-77-0

Mol F.

: C19H23NO2

Mol W.

: 297.39

Cat No.

: SA21700

Clomifene, Impurities

Clomifene EP Impurity C

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CAS No.

: 5635-70-1

Mol F.

: C26H29NO2

Mol W.

: 387.51

Cat No.

: SA21701

Clomifene, Impurities

Clomifene EP Impurity D

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CAS No.

: 1391054-64-0

Mol F.

: C38H46N2O3

Mol W.

: 578.78

Cat No.

: SA21704

Clomifene, Impurities

Clomifene EP Impurity E (Mixture of Z and E Isomers)

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CAS No.

: 117884-83-0

Mol F.

: C26H27Cl2NO

Mol W.

: 440.4

Cat No.

: SA21705

Clomifene, Impurities

Clomifene EP Impurity F ((Mixture of Z and E Isomers)

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CAS No.

: 14158-75-9

Mol F.

: C26H27Cl2NO

Mol W.

: 440.4

Cat No.

: SA21713

Clomifene, Impurities

Clomifene N-Oxide impurity

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CAS No.

: 97642-74-5

Mol F.

: C26H28ClNO2

Mol W.

: 421.96

Cat No.

: SA21703

Clomifene, Impurities

Clomifene Z Isomers

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CAS No.

: 7619-53-6

Mol F.

: C26H28ClNO

Mol W.

: 405.96

Cat No.

: SA21714

Clomipramine, Impurities

Clomipramine

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CAS No.

: 303-49-1

Mol F.

: C19H23ClN2

Mol W.

: 314.85

Cat No.

: SA33700

Clonidine, Impurities

Clonidine

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CAS No.

: 4205-90-7 (freebase); 4205-91-8 (HCl)

Mol F.

: C9H9Cl2N3

Mol W.

: 230.09

Cat No.

: SA42500

Clonidine, Impurities

Clonidine Dimer Impurity

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CAS No.

: 2519452-56-1

Mol F.

: C20H20Cl4N6

Mol W.

: 486.23

Cat No.

: SA42501

Clonidine, Impurities

Clonidine EP Impurity A

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CAS No.

: 5391-39-9

Mol F.

: C5H8N2O2

Mol W.

: 128.13

Cat No.

: SA42504

Clonidine, Impurities

Clonidine EP Impurity C

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CAS No.

: 608-31-1

Mol F.

: C6H6Cl2N

Mol W.

: 162.02

Cat No.

: SA42502

Clonixin, Impurities

Clonixin

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CAS No.

: 17737-65-4

Mol F.

: C13H11ClN2O2

Mol W.

: 262.69

Cat No.

: SA38000

Clotrimazole, Impurities

Clotrimazole EP Impurity C

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CAS No.

: 42074-68-0

Mol F.

: C19H14Cl2

Mol W.

: 313.22

Cat No.

: SA11612

Clotrimazole, Impurities

Clotrimazole EP Impurity D

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CAS No.

: 288-32-4

Mol F.

: C3H4N2

Mol W.

: 68.08

Cat No.

: SA11613

Clotrimazole, Impurities

Clotrimazole EP Impurity F

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CAS No.

: 15469-97-3

Mol F.

: C22H18N2

Mol W.

: 310.39

Cat No.

: SA11615

Aciclovir, Impurities

CNP ( 5-chloro-2-nitro diphenylamine)

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CAS No.

: 25781-92-4

Mol F.

: C12H9ClN2O2

Mol W.

: 248.67

Cat No.

: SA21402

Cobicistat, Impurities

Cobicisat stage-I enantiomer Impurity

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CAS No.

: 1370406-80-6

Mol F.

: C23H27N3O2S.HCl

Mol W.

: 446.01

Cat No.

: SA48616

Cobicistat, Impurities

Cobicisat stage-II Impurity

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CAS No.

Mol F.

: C21H34N4O8S

Mol W.

: 502.58

Cat No.

: SA48610

Cobicistat, Impurities

Cobicistat 2-Amino Amide Impurity

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CAS No.

: 1051463-15-0

Mol F.

: C31H41N5O4S

Mol W.

: 579.79999999999995

Cat No.

: SA48609

Cobicistat, Impurities

Cobicistat 4-Carbonyl Impurity

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CAS No.

Mol F.

: C40H51N7O6S2

Mol W.

: 790

Cat No.

: SA48608

Cobicistat, Impurities

Cobicistat API

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CAS No.

: 1004316-88-4

Mol F.

: C40H53N7O5S2

Mol W.

: 776.03

Cat No.

: SA48600

Cobicistat, Impurities

Cobicistat Cyclized impurity

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CAS No.

Mol F.

: C15H23N3O3S

Mol W.

: 325.43

Cat No.

: SA48613

Cobicistat, Impurities

Cobicistat Dimer Impurity

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CAS No.

Mol F.

: C28H30N4O4S

Mol W.

: 550.69

Cat No.

: SA48614

Cobicistat, Impurities

Cobicistat Enantiomer Impurity

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CAS No.

: 1004316-77-1 (Free Base)

Mol F.

: C18H26Cl2N2

Mol W.

: 341.32

Cat No.

: SA48601

Cobicistat, Impurities

Cobicistat Hydroxy Impurity

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CAS No.

: 1051463-40-1

Mol F.

: C40H53N7O6S2

Mol W.

: 792

Cat No.

: SA48603

Cobicistat, Impurities

Cobicistat Intermediate A Impurity

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CAS No.

: 1247119-33-0

Mol F.

: C23H27N3O2S.HCl

Mol W.

: 446.01

Cat No.

: SA48615

Cobicistat, Impurities

Cobicistat Morpholine acid Impurity

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CAS No.

: 1004316-92-0

Mol F.

: C17H28N4O4S

Mol W.

: 384.49

Cat No.

: SA48612

Cobicistat, Impurities

Cobicistat MTV-Imidazole Impurity

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CAS No.

: 1247119-46-5

Mol F.

: C12H16N4OS

Mol W.

: 264.35000000000002

Cat No.

: SA48611

Cobicistat, Impurities

Cobicistat RRR Isomer

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CAS No.

: 1051463-82-1

Mol F.

: C40H53N7O5S2

Mol W.

: 776

Cat No.

: SA48607

Cobicistat, Impurities

Cobicistat SSR Isomer

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CAS No.

Mol F.

: C40H53N7O5S2

Mol W.

: 776

Cat No.

: SA48605

Cobicistat, Impurities

Cobicistat SSS Isomer

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CAS No.

: 2230789-82-7

Mol F.

: C40H53N7O5S2

Mol W.

: 776

Cat No.

: SA48606

Cobicistat, Impurities

Cobicistat Urea Impurity

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CAS No.

: 1004316-93-1

Mol F.

: C13H19N3O3S

Mol W.

: 297.39999999999998

Cat No.

: SA48604

Colesevelam, Impurities

Colesevelam Trimethylamine Hydrochloride Impurity

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CAS No.

: 593-81-7

Mol F.

: C3H9N·HCl

Mol W.

: 95.57

Cat No.

: SA10218

Hydrocortisone Valerate, Impurities

Cortisone

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CAS No.

: 53-06-5

Mol F.

: C21H28O5

Mol W.

: 360.44

Cat No.

: SA27300

Cyclobenzaprine, Impurities

Cyclobenzaprine 3-Hydroxy Impurity

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CAS No.

: 30235-48-4

Mol F.

: C20H21NO

Mol W.

: 291.39

Cat No.

: SA23107

Cyclobenzaprine, Impurities

Cyclobenzaprine 5-Hydroxy Impurity

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CAS No.

: 18029-54-4

Mol F.

: C20H23NO

Mol W.

: 293.4

Cat No.

: SA23101

Cyclobenzaprine, Impurities

Cyclobenzaprine Desmethyl Hydrochloride

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CAS No.

: 438-59-5

Mol F.

: C19H20ClN

Mol W.

: 297.82

Cat No.

: SA23103

Cyclobenzaprine, Impurities

Cyclobenzaprine Dibenzosuberenone Impurity

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CAS No.

: 2222-33-5

Mol F.

: C15H10O

Mol W.

: 206.24

Cat No.

: SA23106

Cyclobenzaprine, Impurities

Cyclobenzaprine Didesmethyl

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CAS No.

: 1614-47-7

Mol F.

: C18H18ClN

Mol W.

: 283.8

Cat No.

: SA23104

Cyclobenzaprine, Impurities

Cyclobenzaprine HCl

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CAS No.

: 303-53-7 (Base); 6202-23-9 (HCl)

Mol F.

: C20H22ClN

Mol W.

: 311.85

Cat No.

: SA23102

Carbamazepine, Impurities

Cyheptamide

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CAS No.

: 7199-29-3

Mol F.

: C16H15NO

Mol W.

: 237.3

Cat No.

: SA20336

Impurities, Molnupiravir

Cytidine-4-amino analogue impurity

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CAS No.

: NA

Mol F.

: C9H13N3O5

Mol W.

: 243.22

Cat No.

: SA46209

Impurities, Molnupiravir

Cytidine-N3-analogue impurity

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CAS No.

: 1195711-14-8

Mol F.

: C9H13N3O5

Mol W.

: 243.22

Cat No.

: SA46210

Impurities, Topiramate

D-Fructopiranose Hydrochloride

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CAS No.

: 32785-90-3

Mol F.

: C12H19ClO5

Mol W.

: 278.73

Cat No.

: SA45510

Emtricitabine, Impurities

D-Isomenthol Emtricitanibe Impurity

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CAS No.

: 23283-97-8

Mol F.

: C10H20O

Mol W.

: 156.3

Cat No.

: SA22931

Ganciclovir, Impurities

D-Valganciclovir Hydrochloride

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CAS No.

: 1393911-57-3

Mol F.

: C₁₄H₂₃ClN₆O₅

Mol W.

: 390.82

Cat No.

: SA13715

Dacarbazine, Impurities

Dacarbazine

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CAS No.

: 4342-03-4

Mol F.

: C6H10N6O

Mol W.

: 182.18

Cat No.

: SA38800

Dacarbazine, Impurities

Dacarbazine EP Impurity B

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CAS No.

: 360-97-4

Mol F.

: C4H6N4O

Mol W.

: 126.12

Cat No.

: SA38802