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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, Ritlecitinib

Ritlecitinib Degradation Dimer

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CAS No.

Mol F.

: C30H38N10O2

Mol W.

: 570.69

Cat No.

: SA50008

Rivaroxaban

$195.00 100 mg

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CAS No.

: 366789-02-8

Mol F.

: C19H18ClN3O5S

Mol W.

: 435.88

Cat No.

: SA18600

Rivaroxaban

Rivaroxaban Chlorothiophenyl Impurity | CAS : 6310-09-4

$195.00 1 g

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CAS No.

: 6310-09-4

Mol F.

: C6H5ClOS

Mol W.

: 160.6

Cat No.

: SA18635

Impurities, Rivaroxaban

Rivaroxaban Impurity D

$350.00 25 mg

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CAS No.

: 1838139-24-4

Mol F.

: C19H18N3O5ClS

Mol W.

: 435.88

Cat No.

: SA18618

Impurities, Rivaroxaban

Rivaroxaban Nitrophenyl Morpholinone Impurity

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CAS No.

: 446292-04-2

Mol F.

: C10H10N2O4

Mol W.

: 222.20

Cat No.

: SA18636

Impurities, Rizatriptan

Rizatriptan 2-triethylsilyl Indolyl Hydroxy Impurity

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CAS No.

: 160194-33-2

Mol F.

: C19H28N4OSi

Mol W.

: 356.5

Cat No.

: SA52713

Impurities, Rizatriptan

Rizatriptan 6-Methyltriazolyl Indolyl Impurity

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CAS No.

: NA

Mol F.

: C13H14N4O

Mol W.

: 242.3

Cat No.

: SA52716

Impurities, Rizatriptan

Rizatriptan Benzoate | CAS : 145202-66-0

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CAS No.

: 145202-66-0

Mol F.

: 391.47

Mol W.

: C15H19N5.C7H6O2

Cat No.

: SA52700

Rizatriptan

Rizatriptan EP Impurity A | CAS : 887001-08-3

$1,555.00 100 mg

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CAS No.

: 887001-08-3

Mol F.

: C28H35N7

Mol W.

: 469.6

Cat No.

: SA52701

Rizatriptan

Rizatriptan EP Impurity B

$1,555.00 100 mg

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CAS No.

: NA

Mol F.

: C28H32ClN9

Mol W.

: 530.07

Cat No.

: SA52702

Rizatriptan

Rizatriptan EP Impurity C | CAS : 208941-96-2

$2,555.00 100 mg

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CAS No.

: 208941-96-2

Mol F.

: C15H19N5

Mol W.

: 269.4

Cat No.

: SA52703

Impurities, Rizatriptan

Rizatriptan EP Impurity D

$1,555.00 100 mg

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CAS No.

: NA

Mol F.

: C19H28N5

Mol W.

: 326.5

Cat No.

: SA52705

Impurities, Rizatriptan

Rizatriptan EP Impurity E

$1,995.00 100 mg

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CAS No.

: 2757961-25-2

Mol F.

: C16H21N5O2S

Mol W.

: 347.4

Cat No.

: SA52706

Impurities, Rizatriptan

Rizatriptan EP Impurity F

$995.00 100 mg

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CAS No.

: 160194-39-8

Mol F.

: C13H14N4O

Mol W.

: 242.3

Cat No.

: SA52707

Impurities, Rizatriptan

Rizatriptan EP Impurity G

$555.00 500 mg

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CAS No.

: 1000673-59-5

Mol F.

: C13H13ClN4

Mol W.

: 260.7

Cat No.

: SA52704

Impurities, Rizatriptan

Rizatriptan EP Impurity H; Rizatriptan N-oxide

$455.00 100 mg

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CAS No.

: 260435-42-5

Mol F.

: C15H19N5O

Mol W.

: 285.4

Cat No.

: SA52708

Impurities, Rizatriptan

Rizatriptan EP Impurity I

$995.00 100 mg

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CAS No.

: 144034-84-4

Mol F.

: C14H17N5

Mol W.

: 255.3

Cat No.

: SA52709

Impurities, Rizatriptan

Rizatriptan hydrazinylbenzyl Impurity; Rizatriptan Impurity 1

$655.00 1 g

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CAS No.

: 212248-62-9

Mol F.

: C9H13Cl2N5

Mol W.

: 262.14

Cat No.

: SA52717

Impurities, Rizatriptan

Rizatriptan N-Methyl Adduct

$995.00 100 mg

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CAS No.

: 1030849-63-8

Mol F.

: C16H22N5

Mol W.

: 284.4

Cat No.

: SA52712

Impurities, Nitrosamine, Rizatriptan

Rizatriptan N-Nitroso Aniline Impurity

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CAS No.

: NA

Mol F.

: C9H9N5O

Mol W.

: 203.2

Cat No.

: SA52714

Impurities, Rizatriptan

Rizatriptan Nitrobenzyl Triazole Impurity

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CAS No.

: 119192-09-5

Mol F.

: C9H8N4O2

Mol W.

: 204.2

Cat No.

: SA52715

Impurities, Rizatriptan

Rizatriptan Triazole Isomer Impurity

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CAS No.

: 174610-17-4

Mol F.

: C15H19N5

Mol W.

: 269.4

Cat No.

: SA52720

Impurities, Rizatriptan

Rizatriptan Triazolyl Aniline Impurity

$195.00 1 g

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CAS No.

: 119192-10-8

Mol F.

: C9H10N4

Mol W.

: 174.2

Cat No.

: SA52718

Impurities, Rizatriptan

Rizatriptan Triazolyl Iodoaniline Impurity

$1,555.00 500 mg

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CAS No.

: 160194-26-3

Mol F.

: C9H9IN4

Mol W.

: 300.1

Cat No.

: SA52719

Impurities, Roflumilast

Roflumilast

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CAS No.

: 162401-32-3

Mol F.

: C17H14Cl2F2N2O3

Mol W.

: 403.2

Cat No.

: SA38100

Impurities, Roflumilast

Roflumilast Carboxylic Acid Impurity

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CAS No.

: 162401-62-9

Mol F.

: C12H12F2O4

Mol W.

: 258.22

Cat No.

: SA38105

Impurities, Roflumilast

Roflumilast Descyclopropylmethyl Impurity

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CAS No.

: 1391052-76-8

Mol F.

: C13H8Cl2F2N2O3

Mol W.

: 349.11

Cat No.

: SA38102

Impurities, Roflumilast

Roflumilast Dicyclopropylmethoxy Impurity

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CAS No.

: 1391052-24-6

Mol F.

: C20H20Cl2N2O3

Mol W.

: 407.29

Cat No.

: SA38101

Impurities, Roflumilast

Roflumilast Dihydroxy Impurity

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CAS No.

: 1412448-29-3

Mol F.

: C12H8Cl2N2O3

Mol W.

: 299.11

Cat No.

: SA38103

Impurities, Roflumilast

Roflumilast N-Oxide

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CAS No.

: 292135-78-5

Mol F.

: C17H14Cl2F2N2O4

Mol W.

: 419.2

Cat No.

: SA38104

Impurities, Roflumilast

Roflumilast Related Compound C (USP)

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CAS No.

: 22889-78-7

Mol F.

: C5H4Cl2N2

Mol W.

: 163.00

Cat No.

: SA38109

Impurities, Roflumilast

Roflumilast Related Compound E (USP)

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CAS No.

: 3031785-18-6

Mol F.

: C17H14BrClF2N2O3

Mol W.

: 447.66

Cat No.

: SA38108

Impurities, Ropinirole

Ropinirole

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CAS No.

: 91374-21-9

Mol F.

: C16H25ClN2O

Mol W.

: 296.84

Cat No.

: SA41200

Impurities, Ropinirole

Ropinirole 3-Methoxy Impurity

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CAS No.

: 1797131-21-5

Mol F.

: C17H27ClN2O2

Mol W.

: 326.86

Cat No.

: SA41216

Impurities, Ropinirole

Ropinirole Aminoacetic Acid

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CAS No.

: 920755-10-8

Mol F.

: C16H25N2NaO2

Mol W.

: 278.39

Cat No.

: SA41212

Impurities, Ropinirole

Ropinirole Bromoethyl Impurity

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CAS No.

: 120427-96-5

Mol F.

: C10H10BrNO

Mol W.

: 240.1

Cat No.

: SA41213

Impurities, Ropinirole

Ropinirole EP Impurity A

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CAS No.

: 221264-21-7 (HCl salt)

Mol F.

: C16H23ClN2O2

Mol W.

: 310.82

Cat No.

: SA41201

Impurities, Ropinirole

Ropinirole EP Impurity B

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CAS No.

: 249622-60-4

Mol F.

: C16H24N2O

Mol W.

: 260.37

Cat No.

: SA41202

Impurities, Ropinirole

Ropinirole EP Impurity C

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CAS No.

: 221264-43-3 (Z/E); 145570-92-9 (Z)

Mol F.

: C19H29ClN2O

Mol W.

: 336.9

Cat No.

: SA41203

Impurities, Ropinirole

Ropinirole EP Impurity D

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CAS No.

: 173990-76-6

Mol F.

: C13H18N2O.HCl

Mol W.

: 254.76

Cat No.

: SA41204

Impurities, Ropinirole

Ropinirole EP Impurity E

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CAS No.

Mol F.

: C17H24N2O

Mol W.

: 272.39

Cat No.

: SA41205

Impurities, Ropinirole

Ropinirole EP Impurity F

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CAS No.

: 139122-19-3

Mol F.

: C10H11NO2

Mol W.

: 177.2

Cat No.

: SA41206

Impurities, Ropinirole

Ropinirole EP Impurity G

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CAS No.

: 76149-15-0

Mol F.

: C16H24N2

Mol W.

: 244.38

Cat No.

: SA41207

Impurities, Ropinirole

Ropinirole EP Impurity H

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CAS No.

Mol F.

: C16H23N3O2

Mol W.

: 289.37

Cat No.

: SA41208

Impurities, Ropinirole

Ropinirole N-Ethyl Impurity

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CAS No.

: 1797132-03-6

Mol F.

: C18H28N2O

Mol W.

: 288.43

Cat No.

: SA41209

Impurities, Ropinirole

Ropinirole N-Hydroxy Impurity

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CAS No.

: 954117-22-7 (base)

Mol F.

: C16H25ClN2O2

Mol W.

: 312.83

Cat No.

: SA41215

Impurities, Ropinirole

Ropinirole N-Hydroxymethyl Impurity

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CAS No.

: 1027600-42-5

Mol F.

: C17H26N2O2

Mol W.

: 290.4

Cat No.

: SA41210

Impurities, Ropinirole

Ropinirole N-Oxide

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CAS No.

: 1076199-41-1 (base)

Mol F.

: C16H25ClN2O2 (HCl salt)

Mol W.

: 312.83

Cat No.

: SA41214

Impurities, Ropinirole

Ropinirole Open Ring Nitro Impurity

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CAS No.

: 91374-25-3

Mol F.

: C16H25ClN2O4

Mol W.

: 344.83

Cat No.

: SA41211

Impurities, Rosuvastatin

Rosuvastatin (3R,5R)-Isomer Ethyl Ester

$1,050.00 25 mg

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CAS No.

Mol F.

: C24H32FN3O6S

Mol W.

: 509.59

Cat No.

: SA12172