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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, Pantoprazole

Prantoprazole EP Impurity F

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CAS No.

: 721924-06-7

Mol F.

: C17H17F2N3O4S

Mol W.

: 397.4

Cat No.

: SA29106

Impurities, Pravastatin

Pravastatin Lactone

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CAS No.

: 85956-22-5

Mol F.

: C23H34O6

Mol W.

: 406.51

Cat No.

: SA10801

Impurities, Praziquantel

Praziquantel

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CAS No.

: 55268-74-1

Mol F.

: C19H24N2O2

Mol W.

: 312.41

Cat No.

: SA13908

Impurities, Nitrosamine

Praziquantel nitrosamine impurity

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CAS No.

: NA

Mol F.

: C12H13N3O2

Mol W.

: 231.25

Cat No.

: SA44608

Impurities, Prazosin

Prazosin EP Impurity A

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CAS No.

: 23680-84-4

Mol F.

: C10H10ClN3O2

Mol W.

: 239.66

Cat No.

: SA24200

Impurities, Prazosin

Prazosin EP Impurity C

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CAS No.

: 60547-97-9

Mol F.

: C14H19N5O2

Mol W.

: 289.33

Cat No.

: SA24202

Impurities, Prazosin

Prazosin EP Impurity D

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CAS No.

: 40172-95-0

Mol F.

: C9H12N2O2

Mol W.

: 180.2

Cat No.

: SA24203

Impurities, Prednisolone

Prednienic Acid

$125.00 25 mg

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CAS No.

: 37927-29-0

Mol F.

: C20H26O5

Mol W.

: 346.42

Cat No.

: SA16707

Impurities, Prednisolone

Prednisolone 20-Ethyl Ester

$295.00 25 mg

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CAS No.

: 182069-19-8

Mol F.

: C25H34O7

Mol W.

: 446.53

Cat No.

: SA16718

Impurities, Prednisolone

Prednisolone-17-ethylcarbonate

$255.00 25 mg

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CAS No.

: 104286-02-4

Mol F.

: C₂₄H₃₂O₇

Mol W.

: 432.51

Cat No.

: SA16702

Impurities, Prednisolone

Prednisolone-21-acetate-17-ethylcarbonate

$395.00 25 mg

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CAS No.

: 671225-23-3

Mol F.

: C26H34O8

Mol W.

: 474.54

Cat No.

: SA16705

Impurities, Prednisolone

Prednisolone-21-propanoate

$295.00 25 mg

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CAS No.

: 5740-62-5

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA16703

Impurities, Prednisone

Prednisone 17, 21-Diacetate

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CAS No.

: 6677-19-6

Mol F.

: C25H30O7

Mol W.

: 442.5

Cat No.

: SA26201

Impurities, Prednisone

Prednisone 21-Sulfate Ester Sodium Salt

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CAS No.

: 113092-08-3

Mol F.

: C21H25NaO8S

Mol W.

: 460.47

Cat No.

: SA26204

Impurities, Prednisone

Prednisone Epoxide Impurity | CAS NO : 7091-05-6

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CAS No.

: 7091-05-6

Mol F.

: C21H26O5

Mol W.

: 358.4

Cat No.

: SA26222

Impurities, Pregabalin

Pregabalin 3-Cyano Impurity

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CAS No.

: 181289-16-7

Mol F.

: C8H13NO2

Mol W.

: 155.19

Cat No.

: SA24828

Impurities, Pregabalin

Pregabalin Diacid Impurity

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CAS No.

: 5702-99-8

Mol F.

: C8H14O4

Mol W.

: 174.2

Cat No.

: SA24846

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

Impurities, Pregabalin

Pregabalin Lactose Conjugate Impurity

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CAS No.

Mol F.

: C20H35NO11

Mol W.

: 465.49

Cat No.

: SA24847

Impurities, Pregabalin

Pregabalin N-Alkyl Pyrrolidone Derivative

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CAS No.

: 1511511-44-6

Mol F.

: C10H17NO3

Mol W.

: 199.25

Cat No.

: SA24849

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

Impurities, Prochlorperazine Maleate

Prochlorperazine Maleate Degradant II

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CAS No.

Mol F.

: C20H24ClN3O2S

Mol W.

: 405.94

Cat No.

: SA45600

Impurities, Prochlorperazine Maleate

Prochlorperazine Maleate Degradant IV

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CAS No.

Mol F.

: C20H24ClN3OS

Mol W.

: 389.94

Cat No.

: SA45601

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

Impurities, Promazine

Promazine

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CAS No.

: 58-40-2

Mol F.

: C17H20N2S

Mol W.

: 284.4

Cat No.

: SA49800

Impurities, Promazine

Promazine EP Impurity A

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CAS No.

: 146-21-4

Mol F.

: C17H20N2OS

Mol W.

: 300.4

Cat No.

: SA49801

Impurities, Promazine

Promazine EP Impurity B

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CAS No.

: 17140-12-4

Mol F.

: C16H18N2S : HCl

Mol W.

: 270.4 : 36.5

Cat No.

: SA49802

Impurities, Promazine

Promazine EP Impurity C

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CAS No.

: 92-84-2

Mol F.

: C12H9NS

Mol W.

: 199.3

Cat No.

: SA49803

Impurities, Promazine

Promazine EP Impurity D

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CAS No.

Mol F.

: C31H31N3S2 : HCl

Mol W.

: 509.7 : 36.5

Cat No.

: SA49804

Impurities, Promethazine

Promethazine

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CAS No.

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

Mol F.

: C17H21ClN2S

Mol W.

: 320.88

Cat No.

: SA42900

Impurities, Promethazine

Promethazine BP Impurity B

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CAS No.

: 5568-90-1

Mol F.

: C17H21ClN2S

Mol W.

: 320.88

Cat No.

: SA42902

Impurities, Promethazine

Promethazine EP Impurity A

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CAS No.

: 92-84-2

Mol F.

: C12H9NS

Mol W.

: 199.27

Cat No.

: SA42901

Impurities, Promethazine

Promethazine EP Impurity C

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CAS No.

: 60113-77-1

Mol F.

: C16H19ClN2S

Mol W.

: 270.39

Cat No.

: SA42903

Impurities, Promethazine

Promethazine EP Impurity D

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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.

: 275.33999999999997

Cat No.

: SA24606

Impurities, Propranolol

Propranolol 7-Hydroxy Impurity

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CAS No.

: 81907-81-5

Mol F.

: C16H21NO3

Mol W.

: 275.33999999999997

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

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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