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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, Pioglitazone

Pioglitazone Keto Impurity | CAS : 146062-45-5

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CAS No.

: 146062-45-5

Mol F.

: C19H20N2O4S

Mol W.

: 372.4

Cat No.

: SA52820

Pioglitazone

Pioglitazone N-Oxide | CAS : 145350-09-0

$455.00 100 mg

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CAS No.

: 145350-09-0

Mol F.

: C19H20N2O4S

Mol W.

: 372.4

Cat No.

: SA52818

Impurities, Pioglitazone

Pioglitazone Propanoic Acid Impurity | CAS : 1229114-66-2

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CAS No.

: 1229114-66-2

Mol F.

: C18H21NO3S

Mol W.

: 331.4

Cat No.

: SA52806

Impurities, Pioglitazone

Pioglitazone Related Compound B | CAS : 669716-56-7

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CAS No.

: 669716-56-7

Mol F.

: C34H35N3O4S

Mol W.

: 581.7

Cat No.

: SA52814

Impurities, Piperidine

Piperidine Hydrochloride

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CAS No.

: 6091-44-7

Mol F.

: C5H12ClN

Mol W.

: 121.61

Cat No.

: SA49300

Apixaban, Impurities

Piperidone Apixaban Impurity

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CAS No.

: 2098457-92-0

Mol F.

: C26H27N5O4

Mol W.

: 473.52

Cat No.

: SA39952

Bumetanide, Impurities

Piretanide

$350.00 25 mg

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CAS No.

: 55837-27-9

Mol F.

: C17H18N2O5S

Mol W.

: 362.4

Cat No.

: SA24409

Impurities, Pirfenidone

Pirfenidone

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CAS No.

: 53179-13-8

Mol F.

: C12H11NO

Mol W.

: 185.22

Cat No.

: SA37200

Impurities, Pirfenidone

Pirfenidone 5-Carboxylic Acid Impurity

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CAS No.

: 77837-08-2;1189982-99-7(NaSalt)

Mol F.

: C12H9NO3

Mol W.

: 215.2

Cat No.

: SA37705

Impurities, Pirfenidone

Pirfenidone 5-Carboxylic Acid Impurity

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CAS No.

: 77837-08-2; 1189982-99-7 (Na Salt)

Mol F.

: C12H9NO3

Mol W.

: 215.2

Cat No.

: SA37205

Impurities, Pirfenidone

Pirfenidone 5-Hydroxymethyl Impurity

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CAS No.

: 887406-49-7

Mol F.

: C12H11NO2

Mol W.

: 201.22

Cat No.

: SA37706

Impurities, Pirfenidone

Pirfenidone 5-Hydroxymethyl Impurity

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CAS No.

: 887406-49-7

Mol F.

: C12H11NO2

Mol W.

: 201.22

Cat No.

: SA37206

Impurities, Pirfenidone

Pirfenidone EP Impurity A

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CAS No.

: 1603-41-4

Mol F.

: C6H8N2

Mol W.

: 108.14

Cat No.

: SA37201

Impurities, Pirfenidone

Pirfenidone EP Impurity B

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CAS No.

: 1003-68-5

Mol F.

: C6H9NO

Mol W.

: 111.14

Cat No.

: SA37202

Impurities, Pirfenidone

Pirfenidone EP Impurity C

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CAS No.

: 108-95-2

Mol F.

: C6H6O

Mol W.

: 94.11

Cat No.

: SA37203

Impurities, Pirfenidone

Pirfenidone EP Impurity D

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CAS No.

: 108-86-1

Mol F.

: C6H5Br

Mol W.

: 157.01

Cat No.

: SA37204

Pitavastatin

Pitavastatin (3R,5R) Ethyl Ester

$255.00 10 mg

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CAS No.

: 380848-32-8

Mol F.

: C27H28FNO4

Mol W.

: 449.51

Cat No.

: SA29507

Pitavastatin

Pitavastatin (3S,5R) Ethyl Ester

$295.00 25 mg

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CAS No.

Mol F.

: C27H28FNO4

Mol W.

: 449.51

Cat No.

: SA29508

Pitavastatin

Pitavastatin (3S,5S) Ethyl Ester

$455.00 25 mg

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CAS No.

: 380848-30-6

Mol F.

: C27H28FNO4

Mol W.

: 449.51

Cat No.

: SA29509

Impurities, Pitavastatin

Pitavastatin 3-Oxo Ethyl Ester

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CAS No.

: 148901-69-3

Mol F.

: C₂₇H₂₆FNO₄

Mol W.

: 447.5

Cat No.

: SA29517

Pitavastatin

Pitavastatin 5-Oxo Ethyl Ester

$795.00 100 mg

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CAS No.

Mol F.

: C27H26FNO4

Mol W.

: 447.5

Cat No.

: SA29520

Impurities, Pitavastatin

Pitavastatin 5-Oxo Ethyl Ester

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CAS No.

: 444732-68-7

Mol F.

: C27H26FNO4

Mol W.

: 447.5

Cat No.

: SA29518

Pitavastatin

Pitavastatin Acetonide t-Butyl Ester

$195.00 1 g

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CAS No.

: 147489-06-3

Mol F.

: C32H36FNO4

Mol W.

: 517.63

Cat No.

: SA29524

Impurities, Pitavastatin

Pitavastatin Calcium

$80.00 25 mg

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CAS No.

: 147511-69-1 (Base); 147526-32-7 (Ca salt)

Mol F.

: (C25H23FNO4)2.Ca (Calcium Salt); C25H23FNO4

Mol W.

: 880.98 (Ca); 421.45 (Acid)

Cat No.

: SA29504

Pitavastatin

Pitavastatin Desfluoro Acetonide t-Butyl Ester

$995.00 100 mg

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CAS No.

Mol F.

: C32H37NO4

Mol W.

: 499.64

Cat No.

: SA29511

Pitavastatin

Pitavastatin Desfluoro t-Butyl Ester

$995.00 100 mg

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CAS No.

Mol F.

: C29H33NO4

Mol W.

: 459.58

Cat No.

: SA29510

Pitavastatin

Pitavastatin Ethyl Ester

$195.00 25 mg

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CAS No.

: 167073-19-0

Mol F.

: C27H28FNO4

Mol W.

: 449.51

Cat No.

: SA29513

Pitavastatin

Pitavastatin Hydroxymethyl

$195.00 1 g

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CAS No.

: 121660-11-5

Mol F.

: C₁₉H₁₆FNO

Mol W.

: 293.33

Cat No.

: SA29516

Pitavastatin

Pitavastatin Methylbenzylamine | CAS : 147511-70-4

$555.00 1 g

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CAS No.

: 147511-70-4

Mol F.

: C33H35FN2O4

Mol W.

: 542.64

Cat No.

: SA29528

Pitavastatin

Pitavastatin N-Oxide | CAS : 1611499-16-1

$755.00 100 mg

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CAS No.

: 1611499-16-1

Mol F.

: C25H24FNO5

Mol W.

: 437.46

Cat No.

: SA29527

Pantoprazole

Prantoprazole EP Impurity E

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CAS No.

: 2115779-15-0

Mol F.

: C32H28F4N6O8S2

Mol W.

: 764.72

Cat No.

: SA29105

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 Hemisuccinate

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CAS No.

: 2920-86-7

Mol F.

: C25H32O8

Mol W.

: 460.5

Cat No.

: SA16722

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

Pregabalin

Pregabalin (R)-Phenethylamine Impurity

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CAS No.

: 3886-69-9

Mol F.

: C8H11N

Mol W.

: 121.18

Cat No.

: SA24852

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