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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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Pregabalin

Pregabalin EP Impurity A; (S)-Pregabalin Lactam

$125.00 25 mg

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CAS No.

: 181289-23-6

Mol F.

: C8H15NO

Mol W.

: 141.21

Cat No.

: SA24820

Pregabalin

Pregabalin Impurity 30; Pregabalin N-Alkyl Pyrrolidone Derivative

$995.00 500 mg

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CAS No.

: 1511511-44-6

Mol F.

: C10H17NO3

Mol W.

: 199.25

Cat No.

: SA24849

Pregabalin

Pregabalin Impurity 4; 3-(2-Methylpropyl)pentanedioic Acid

$75.00 25 mg

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CAS No.

: 75143-89-4

Mol F.

: C9H16O4

Mol W.

: 188.22

Cat No.

: SA24807

Impurities, Pregabalin

Pregabalin Isobutyl Succinimide Impurity | CAS : 164597-78-8

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CAS No.

: 164597-78-8

Mol F.

: C8H13NO2

Mol W.

: 155.19

Cat No.

: SA24848

Pregabalin

Pregabalin Lactose Conjugate Impurity

$1,555.00 50 mg

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CAS No.

: 466678-44-4

Mol F.

: C20H35NO11

Mol W.

: 465.49

Cat No.

: SA24847

Impurities, Pregabalin

Pregabalin Sec Amide Impurity

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CAS No.

: 930585-94-7

Mol F.

: C17H25NO3

Mol W.

: 291.4

Cat No.

: SA24850

Impurities, Testosterone

Prenortestosterone

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CAS No.

: 1089-78-7

Mol F.

: C18H26O2

Mol W.

: 274.4

Cat No.

: SA16201

Impurities, Primidone

Primidone

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CAS No.

: 125-33-7

Mol F.

: C₁₂H₁₄N₂O₂

Mol W.

: 218.25

Cat No.

: SA20600

Prochlorperazine Maleate

Prochlorperazine N-Oxide Impurity 1

$355.00 50 mg

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CAS No.

Mol F.

: C20H24ClN3OS

Mol W.

: 389.94

Cat No.

: SA45601

Prochlorperazine Maleate

Prochlorperazine Phenothiazine Dimer Impurity

$1,555.00 100 mg

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CAS No.

: NA

Mol F.

: C27H20Cl2N2S2

Mol W.

: 507.50

Cat No.

: SA45606

Prochlorperazine Maleate

Prochlorperazine Sulfinyl-5-Oxide

$755.00 50 mg

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CAS No.

: 879495-68-8

Mol F.

: C20H24ClN3O2S

Mol W.

: 405.94

Cat No.

: SA45600

Impurities, Progesterone

Progesterone

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CAS No.

: 57-83-0

Mol F.

: C21H30O2

Mol W.

: 314.46

Cat No.

: SA18000

Impurities, Progesterone

Progesterone 17α-Hydroxy Impurity

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CAS No.

: 68-96-2

Mol F.

: C21H30O3

Mol W.

: 330.46

Cat No.

: SA18016

Impurities, Progesterone

Progesterone EP Impurity I

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CAS No.

: 24254-01-1

Mol F.

: C22H32O2

Mol W.

: 328.49

Cat No.

: SA18007

Impurities, Progesterone

Progesterone EP Impurity L

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CAS No.

: 2257421-80-8

Mol F.

: C22H30O2

Mol W.

: 326.48

Cat No.

: SA18010

Promazine

$555.00 1 g

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CAS No.

: 58-40-2

Mol F.

: C17H20N2S

Mol W.

: 284.4

Cat No.

: SA49800

Promazine

Promazine EP Impurity A

$355.00 100 mg

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CAS No.

: 146-21-4

Mol F.

: C17H20N2OS

Mol W.

: 300.4

Cat No.

: SA49801

Promazine

Promazine EP Impurity B

$555.00 100 mg

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CAS No.

: 17140-12-4

Mol F.

: C16H18N2S : HCl

Mol W.

: 270.4 : 36.5

Cat No.

: SA49802

Promazine

Promazine EP Impurity C

$195.00 1 g

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CAS No.

: 92-84-2

Mol F.

: C12H9NS

Mol W.

: 199.3

Cat No.

: SA49803

Promazine

Promazine EP Impurity D

$995.00 100 mg

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CAS No.

Mol F.

: C31H31N3S2 : HCl

Mol W.

: 509.7 : 36.5

Cat No.

: SA49804

Promethazine

$255.00 1 g

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CAS No.

: 60-87-7;58-33-3(HCl)

Mol F.

: C17H21ClN2S

Mol W.

: 320.88

Cat No.

: SA42900

Promethazine

Promethazine BP Impurity B

$1,995.00 100 mg

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CAS No.

: 5568-90-1

Mol F.

: C17H21ClN2S

Mol W.

: 320.88

Cat No.

: SA42902

Promethazine

Promethazine EP Impurity A

$195.00 1 g

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CAS No.

: 92-84-2

Mol F.

: C12H9NS

Mol W.

: 199.27

Cat No.

: SA42901

Promethazine

Promethazine EP Impurity C

$655.00 100 mg

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CAS No.

: 60113-77-1

Mol F.

: C16H19ClN2S

Mol W.

: 270.39

Cat No.

: SA42903

Promethazine

Promethazine EP Impurity D

$855.00 100 mg

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CAS No.

: 7640-51-9

Mol F.

: C17H20N2OS

Mol W.

: 300.42

Cat No.

: SA42904

Impurities, Propranolol

Propranolol 5-Hydroxy Impurity

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CAS No.

: 62117-35-5

Mol F.

: C16H21NO3

Mol W.

: 275.34

Cat No.

: SA24606

Impurities, Propranolol

Propranolol 7-Hydroxy Impurity

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CAS No.

: 81907-81-5

Mol F.

: C16H21NO3

Mol W.

: 275.34

Cat No.

: SA24605

Impurities, Propranolol

Propranolol Azide impurity

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CAS No.

: 87102-64-5

Mol F.

: C13H13N3O2

Mol W.

: 243.26

Cat No.

: SA24608

Impurities, Propranolol

Propranolol N-Desisopropyl Impurity

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CAS No.

: 62618-09-1

Mol F.

: C13H16ClNO2

Mol W.

: 253.72

Cat No.

: SA24604

Impurities, Prucalopride

Prucalopride Hydroxy Impurity

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CAS No.

: 1900715-97-0

Mol F.

: C18H26ClN3O4

Mol W.

: 383.87

Cat No.

: SA43102

Impurities, Prucalopride

Prucalopride impurity B

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CAS No.

: 182808-16-8

Mol F.

: C9H9ClN2O2

Mol W.

: 212.63

Cat No.

: SA43106

Impurities, Prucalopride

Prucalopride impurity D

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CAS No.

: 182808-04-4

Mol F.

: C10H10ClNO3

Mol W.

: 227.64

Cat No.

: SA43107

Impurities, Prucalopride

Prucalopride N-Desmethoxypropyl Impurity

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CAS No.

: 137211-64-4

Mol F.

: C14H18ClN3O2

Mol W.

: 295.76

Cat No.

: SA43100

Impurities, Prucalopride

Prucalopride N-Ethoxycarbonyl Analog

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CAS No.

: 137211-63-3

Mol F.

: C17H22ClN3O4

Mol W.

: 367.83

Cat No.

: SA43105

Impurities, Prucalopride

Prucalopride RC 4

Please enquire for price & pack size

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CAS No.

: 1900715-96-9

Mol F.

: C18H24ClN3O3

Mol W.

: 365.85

Cat No.

: SA43103

Impurities, Prucalopride

Prucalopride Succinate

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CAS No.

: 179474-85-2; 179474-81-8 (free base)

Mol F.

: C22H32ClN3O7

Mol W.

: 485.96

Cat No.

: SA43109

Impurities, Prucalopride

Prucalopride-N-Galactopyranoside

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CAS No.

: NA

Mol F.

: C24H36ClN3O8

Mol W.

: 530.01

Cat No.

: SA43104

Impurities, Prucalopride

Prucalopride-N-Oxide

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CAS No.

: 1900715-98-1

Mol F.

: C18H26ClN3O4

Mol W.

: 383.87

Cat No.

: SA43101

Impurities, Niacin

Pyridine

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CAS No.

: 110-86-1

Mol F.

: C5H5N

Mol W.

: 79.10

Cat No.

: SA33106

Donepezil, Impurities

Pyridine Dehydro Donepezil Impurity

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CAS No.

: 4803-74-1

Mol F.

: C17H15NO3

Mol W.

: 281.31

Cat No.

: SA34316

Donepezil, Impurities

Pyridine Dehydro N-Oxide Donepezil Impurity

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CAS No.

: 896134-06-8

Mol F.

: C17H15NO4

Mol W.

: 297.31

Cat No.

: SA34314

Donepezil, Impurities

Pyridine N-Oxide Donepezil

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CAS No.

: 896134-07-9

Mol F.

: C17H17NO4

Mol W.

: 299.32

Cat No.

: SA34315

Impurities, Palbociclib

Pyridine N-Oxide Palbociclib

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CAS No.

: 2098673-40-4

Mol F.

: C24H29N7O3

Mol W.

: 464.53

Cat No.

: SA40405

Impurities, Pyrrolidine

Pyrrolidine

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CAS No.

: 123-75-1

Mol F.

: C4H9N

Mol W.

: 71.11

Cat No.

: SA49400

Impurities, Quetiapine

Quetiapine EP Impurity A

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CAS No.

: 844639-07-2

Mol F.

: C23H27N3O3S

Mol W.

: 425.54

Cat No.

: SA13007

Impurities, Quetiapine

Quetiapine EP Impurity B

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CAS No.

: 5747-48-8

Mol F.

: C17H17N3S

Mol W.

: 295.41

Cat No.

: SA13003

Impurities, Quetiapine

Quetiapine EP impurity C

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CAS No.

: 1798840-31-9

Mol F.

: C40H42N6O3S2

Mol W.

: 718.95

Cat No.

: SA13008

Impurities, Quetiapine

Quetiapine EP Impurity D

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CAS No.

: 945668-94-0

Mol F.

: C30H24N4S2

Mol W.

: 504.67

Cat No.

: SA13006

Impurities, Quetiapine

Quetiapine EP Impurity E

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CAS No.

: 1371638-05-9

Mol F.

: C40H44N6O2S2

Mol W.

: 704.95

Cat No.

: SA13009

Impurities, Quetiapine

Quetiapine EP impurity F

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CAS No.

: 848814-27-7

Mol F.

: C₂₁H₂₇N₃O₃S

Mol W.

: 401.52

Cat No.

: SA13010