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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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Impurities, Rilpivirine

Rilpivirine Nitrile Z Isomer Impurity

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CAS No.

: 661489-22-1

Mol F.

: C11H12N2

Mol W.

: 172.23

Cat No.

: SA25417

Impurities, Riociguat

Riociguat

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CAS No.

: 625115-55-1

Mol F.

: C20H19FN8O2

Mol W.

: 422.4

Cat No.

: SA50800

Riociguat

Riociguat Des formyl Impurity; Riociguat Impurity 6

$555.00 100 mg

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CAS No.

: 1702271-98-4

Mol F.

: C18H17FN8

Mol W.

: 364.4

Cat No.

: SA50816

Riociguat

Riociguat Impurity D

$355.00 25 mg

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CAS No.

: 625115-54-0

Mol F.

: C22H23FN8O2

Mol W.

: 450.48

Cat No.

: SA50804

Impurities, Riociguat

Riociguat Intermediate

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CAS No.

: 428854-23-3

Mol F.

: C23H18FN9

Mol W.

: 439.5

Cat No.

: SA50809

Impurities, Riociguat

Riociguat M1 Glucuronide

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CAS No.

: 2298383-28-3

Mol F.

: C25H25FN8O8

Mol W.

: 584.5

Cat No.

: SA50811

Riociguat

Riociguat N-Nitroso Des Formyl Impurity

$595.00 50 mg

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CAS No.

Mol F.

: C18H16FN9O

Mol W.

: 393.4

Cat No.

: SA50805

Riociguat

Riociguat N-Oxide

$355.00 100 mg

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CAS No.

Mol F.

: C20H19FN8O3

Mol W.

: 438.4

Cat No.

: SA50810

Riociguat

Riociguat Nitroso USP Related Compound C

$995.00 100 mg

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CAS No.

Mol F.

: C21H20FN9O3

Mol W.

: 465.4

Cat No.

: SA50807

Riociguat

Riociguat Tri Amino impurity

$195.00 1 g

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CAS No.

: 428854-24-4

Mol F.

: C17H15FN8

Mol W.

: 350.4

Cat No.

: SA50808

Riociguat

Riociguat USP Related Compound A; Riociguat EP Impurity A

$255.00 100 mg

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CAS No.

: 625115-52-8; 1309776-67-7 (HCl salt)

Mol F.

: C19H17FN8O2

Mol W.

: 408.4

Cat No.

: SA50801

Riociguat

Riociguat USP Related Compound B; Riociguat EP Impurity B

$755.00 100 mg

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CAS No.

: 3052969-92-0

Mol F.

: C20H20N8O2

Mol W.

: 404.4

Cat No.

: SA50802

Riociguat

Riociguat USP Related Compound C; Riociguat EP Impurity C

$555.00 100 mg

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CAS No.

: 2920299-23-4

Mol F.

: C21H21FN8O2

Mol W.

: 436.5

Cat No.

: SA50803

Impurities, Risdiplam

Risdiplam 3-ethylpiperazinyl Impurity

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CAS No.

: NA

Mol F.

: C22H25N7O

Mol W.

: 403.48

Cat No.

: SA52313

Impurities, Risdiplam

Risdiplam 3-hydroxypropanamide Impurity

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CAS No.

: NA

Mol F.

: C21H23N7O3

Mol W.

: 421.45

Cat No.

: SA52303

Impurities, Risdiplam

Risdiplam 7-hydroxy Pyridopyrimidinone Impurity

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CAS No.

: NA

Mol F.

: C16H13N5O2

Mol W.

: 307.31

Cat No.

: SA52308

Impurities, Risdiplam

Risdiplam 7-methoxy Pyridopyrimidinone Impurity

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CAS No.

: NA

Mol F.

: C17H15N5O2

Mol W.

: 321.33

Cat No.

: SA52311

Impurities, Risdiplam

Risdiplam API | CAS : 1825352-65-5

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CAS No.

: 1825352-65-5

Mol F.

: C22H23N7O

Mol W.

: 401.5

Cat No.

: SA52300

Impurities, Risdiplam

Risdiplam Biimidazopyridazinyl Impurity

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CAS No.

: NA

Mol F.

: C30H30N10O

Mol W.

: 546.6

Cat No.

: SA52304

Impurities, Risdiplam

Risdiplam Bipyridopyrimidine-4,4′-dione Impurity

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CAS No.

: NA

Mol F.

: C28H30N8O2

Mol W.

: 510.59

Cat No.

: SA52306

Impurities, Risdiplam

Risdiplam Bispyrimidinone Impurity

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CAS No.

: NA

Mol F.

: C36H37N11O2

Mol W.

: 655.75

Cat No.

: SA52305

Impurities, Risdiplam

Risdiplam Imidazopyridazine Dimer Impurity

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CAS No.

: NA

Mol F.

: C16H16N6

Mol W.

: 292.34

Cat No.

: SA52314

Impurities, Risdiplam

Risdiplam Piperazine Amide (E) Isomer Impurity

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CAS No.

: NA

Mol F.

: C21H23N7O2

Mol W.

: 405.45

Cat No.

: SA52302

Impurities, Risdiplam

Risdiplam Piperazine Amide (Z) Isomer Impurity

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CAS No.

: NA

Mol F.

: C21H23N7O2

Mol W.

: 405.45

Cat No.

: SA52301

Impurities, Risperidone

Risperidone

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CAS No.

: 106266-06-2

Mol F.

: C23H27FN4O2

Mol W.

: 410.48

Cat No.

: SA26300

Impurities, Risperidone

Risperidone 2,4-difluorophenyl piperidinyl oxime Impurity

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CAS No.

: NA

Mol F.

: C12H14F2N2O

Mol W.

: 240.25

Cat No.

: SA26325

Impurities, Risperidone

Risperidone 4-Hydroxybenzoyl Impurity

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CAS No.

: 1391053-32-9

Mol F.

: C23H28FN3O3

Mol W.

: 413.49

Cat No.

: SA26314

Impurities, Risperidone

Risperidone Acetylpiperidine Impurity

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CAS No.

: NA

Mol F.

: C26H27F2N3O3

Mol W.

: 467.51

Cat No.

: SA26315

Impurities, Risperidone

Risperidone Desfluoro 2-Hydroxybenzoyl Impurity

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CAS No.

: NA

Mol F.

: C23H29N3O3

Mol W.

: 395.49

Cat No.

: SA26316

Impurities, Risperidone

Risperidone Difluoro Acetyl Impurity

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CAS No.

: 84162-82-3

Mol F.

: C14H15F2NO2

Mol W.

: 267.27

Cat No.

: SA26317

Impurities, Risperidone

Risperidone Difluorobenzoyl Impurity

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CAS No.

: 106266-04-0

Mol F.

: C12H14ClF2NO

Mol W.

: 261.7

Cat No.

: SA26318

Impurities, Risperidone

Risperidone EP Impurity A

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CAS No.

: 691007-09-7

Mol F.

: C23H28F2N4O2

Mol W.

: 430.49

Cat No.

: SA26301

Impurities, Risperidone

Risperidone EP Impurity B

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CAS No.

: 132961-05-8

Mol F.

: C23H28F2N4O2

Mol W.

: 430.49

Cat No.

: SA26302

Impurities, Risperidone

Risperidone EP Impurity C

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CAS No.

: 144598-75-4

Mol F.

: C23H27FN4O3

Mol W.

: 426.48

Cat No.

: SA26303

Impurities, Risperidone

Risperidone EP Impurity D

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CAS No.

: 1199589-74-6

Mol F.

: C23H27FN4O2

Mol W.

: 410.48

Cat No.

: SA26304

Impurities, Risperidone

Risperidone EP Impurity E

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CAS No.

: 1346602-28-5

Mol F.

: C24H29FN4O2

Mol W.

: 424.51

Cat No.

: SA26305

Impurities, Risperidone

Risperidone EP Impurity F

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CAS No.

: 1346603-86-8

Mol F.

: C24H27FN4O4

Mol W.

: 454.49

Cat No.

: SA26306

Impurities, Risperidone

Risperidone EP Impurity H

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CAS No.

: 158697-67-7

Mol F.

: C23H27F2N3O2

Mol W.

: 415.48

Cat No.

: SA26307

Impurities, Risperidone

Risperidone EP Impurity I

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CAS No.

: 1329796-66-8

Mol F.

: C36H39F2N5O3

Mol W.

: 615.71

Cat No.

: SA26308

Impurities, Risperidone

Risperidone EP Impurity J

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CAS No.

: 1346606-24-3

Mol F.

: C35H40F2N6O3

Mol W.

: 630.73

Cat No.

: SA26309

Impurities, Risperidone

Risperidone EP Impurity K

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CAS No.

: 106266-09-5

Mol F.

: C23H28N4O2

Mol W.

: 392.49

Cat No.

: SA26310

Impurities, Risperidone

Risperidone EP Impurity L

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CAS No.

: 63234-80-0

Mol F.

: C11H15ClN2O

Mol W.

: 226.7

Cat No.

: SA26311

Impurities, Risperidone

Risperidone EP Impurity M

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CAS No.

: 84163-77-9(base);84163-13-3(HClsalt)

Mol F.

: C12H13FN2O

Mol W.

: 220.24

Cat No.

: SA26312

Impurities, Risperidone

Risperidone Ethyl Impurity

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CAS No.

: 70381-58-7

Mol F.

: C11H16N2O

Mol W.

: 192.26

Cat No.

: SA26319

Impurities, Risperidone

Risperidone Hydroxyethyl Impurity

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CAS No.

: 66698-27-9

Mol F.

: C11H16N2O2

Mol W.

: 208.26

Cat No.

: SA26320

Impurities, Risperidone

Risperidone N-Oxide

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CAS No.

: 832747-55-4

Mol F.

: C23H27FN4O3

Mol W.

: 426.48

Cat No.

: SA26313

Impurities, Risperidone

Risperidone Piperidine Impurity

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CAS No.

: NA

Mol F.

: C24H25F2N3O2

Mol W.

: 425.47

Cat No.

: SA26321

Impurities, Risperidone

Risperidone Pyridopyrimidinone Impurity | CAS : 41078-70-0

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CAS No.

: 41078-70-0

Mol F.

: C11H11ClN2O

Mol W.

: 222.67

Cat No.

: SA26324

Impurities, Risperidone

Risperidone USP RC G

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CAS No.

: 152542-00-2

Mol F.

: C23H28FN3O3

Mol W.

: 413.49

Cat No.

: SA26322

Impurities, Ritlecitinib

Ritlecitinib

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CAS No.

Mol F.

: C15H19N5O

Mol W.

: 285.34

Cat No.

: SA50000