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Impurities

SynThink is a producer and supplier of a number of pharmaceutical Reference Standards (Impurity Standards) which are required for pharmaceutical companies to study quality, stability and biological safety of pharmaceutical products. Many API Impurities are available in our stock.

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Impurities, Pemetrexed

Pemetrexed Dihydro 6-Oxo Acid Methyl Ester

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Out of Stock

CAS No.

: 1320346-43-7

Mol F.

: C16H16N4O4

Mol W.

: 328.32

Cat No.

: SA32317

Impurities, Pemetrexed

Pemetrexed EP Impurity A

$250.00 25 mg

Out of Stock

CAS No.

: 869791-42-4

Mol F.

: C21H23N5O6

Mol W.

: 441.44

Cat No.

: SA32302

Impurities, Pemetrexed

Pemetrexed EP Impurity B

$1,550.00 25 mg

Out of Stock

CAS No.

: 1802552-04-0

Mol F.

: C40H40N10O13

Mol W.

: 868.8

Cat No.

: SA32303

Impurities, Pemetrexed

Pemetrexed EP Impurity C

$1,850.00 25 mg

Out of Stock

CAS No.

: 1802552-16-4

Mol F.

: C40H40N10O13

Mol W.

: 868.8

Cat No.

: SA32304

Impurities, Ruxolitinib

Pemetrexed Keto impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 193281-00-4

Mol F.

: C22H25N5O7

Mol W.

: 471.46

Cat No.

: SA43400

Impurities, Pemetrexed

Pemetrexed N-Methyl Dimethyl Ester

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Out of Stock

CAS No.

: NA

Mol F.

: C23H27N5O6

Mol W.

: 469.49

Cat No.

: SA32310

Impurities, Pemetrexed

Pemetrexed R-Isomer Diethyl Ester

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Out of Stock

CAS No.

: NA

Mol F.

: C24H29N5O6

Mol W.

: 483.52

Cat No.

: SA32311

Impurities, Pemetrexed

Pemetrexed R-Isomer Dimethyl Ester

$395.00 25 mg

Out of Stock

CAS No.

: 1391068-12-4

Mol F.

: C22H25N5O6

Mol W.

: 455.46

Cat No.

: SA32312

Impurities, Pemetrexed

Pemetrexed α-Dipeptide Impurity

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Out of Stock

CAS No.

: 883553-87-5

Mol F.

: C25H28N6O9

Mol W.

: 556.53

Cat No.

: SA32321

Impurities, Sofosbuvir

Pentafluoro Sofosbuvir Impurity

$100.00 10 mg

Out of Stock

CAS No.

: 1337529-56-2

Mol F.

: C18H17F5NO5P

Mol W.

: 453.3

Cat No.

: SA15441

Impurities, Sofosbuvir

Pentafluoro Sofosbuvir Impurity (SP-Isomer) | CAS : 1334513-02-8

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Out of Stock

CAS No.

: 1334513-02-8

Mol F.

: C18H17F5NO5P

Mol W.

: 453.30

Cat No.

: SA15445

Impurities, Remdesivir

Pentafluorophenol

$100.00 100 mg

Out of Stock

CAS No.

: 771-61-9

Mol F.

: C6HF5O

Mol W.

: 184.06

Cat No.

: SA42731

Impurities, Piperidine

Piperidine Hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 6091-44-7

Mol F.

: C5H12ClN

Mol W.

: 121.61

Cat No.

: SA49300

Apixaban, Impurities

Piperidone Apixaban Impurity

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Out of Stock

CAS No.

: 2098457-92-0

Mol F.

: C26H27N5O4

Mol W.

: 473.52

Cat No.

: SA39952

Bumetanide, Impurities

Piretanide

$350.00 25 mg

Out of Stock

CAS No.

: 55837-27-9

Mol F.

: C17H18N2O5S

Mol W.

: 362.4

Cat No.

: SA24409

Impurities, Pirfenidone

Pirfenidone

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Out of Stock

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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Out of Stock

CAS No.

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

Mol F.

: C12H9NO3

Mol W.

: 215.2

Cat No.

: SA37205

Impurities, Pirfenidone

Pirfenidone 5-Carboxylic Acid Impurity

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Out of Stock

CAS No.

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

Mol F.

: C12H9NO3

Mol W.

: 215.2

Cat No.

: SA37705

Impurities, Pirfenidone

Pirfenidone 5-Hydroxymethyl Impurity

Please enquire for price & pack size

Out of Stock

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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Out of Stock

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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Out of Stock

CAS No.

: 1603-41-4

Mol F.

: C6H8N2

Mol W.

: 108.14

Cat No.

: SA37201

Impurities, Pirfenidone

Pirfenidone EP Impurity B

Please enquire for price & pack size

Out of Stock

CAS No.

: 1003-68-5

Mol F.

: C6H9NO

Mol W.

: 111.14

Cat No.

: SA37202

Impurities, Pirfenidone

Pirfenidone EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 108-95-2

Mol F.

: C6H6O

Mol W.

: 94.11

Cat No.

: SA37203

Impurities, Pirfenidone

Pirfenidone EP Impurity C

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Out of Stock

CAS No.

: 108-95-2

Mol F.

: C6H6O

Mol W.

: 94.11

Cat No.

: SA37703

Impurities, Pirfenidone

Pirfenidone EP Impurity D

Please enquire for price & pack size

Out of Stock

CAS No.

: 108-86-1

Mol F.

: C6H5Br

Mol W.

: 157.01

Cat No.

: SA37704

Impurities, Pirfenidone

Pirfenidone EP Impurity D

Please enquire for price & pack size

Out of Stock

CAS No.

: 108-86-1

Mol F.

: C6H5Br

Mol W.

: 157.01

Cat No.

: SA37204

Impurities, Pitavastatin

Pitavastatin (3R,5R) Ethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 380848-32-8

Mol F.

: C27H28FNO4

Mol W.

: 449.51

Cat No.

: SA29507

Impurities, Pitavastatin

Pitavastatin (3S,5R) Ethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C27H28FNO4

Mol W.

: 449.51

Cat No.

: SA29508

Impurities, Pitavastatin

Pitavastatin (3S,5S) Ethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 380848-30-6

Mol F.

: C27H28FNO4

Mol W.

: 449.51

Cat No.

: SA29509

Impurities, Pitavastatin

Pitavastatin 3-Oxo Ethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 148901-69-3

Mol F.

: C₂₇H₂₆FNO₄

Mol W.

: 447.5

Cat No.

: SA29517

Impurities, Pitavastatin

Pitavastatin 5-Oxo Ethyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C27H26FNO4

Mol W.

: 447.5

Cat No.

: SA29520

Impurities, Pitavastatin

Pitavastatin 5-Oxo Ethyl Ester

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Out of Stock

CAS No.

: 444732-68-7

Mol F.

: C27H26FNO4

Mol W.

: 447.5

Cat No.

: SA29518

Impurities, Pitavastatin

Pitavastatin Acetonide t-Butyl Ester

Please enquire for price & pack size

Out of Stock

CAS No.

: 147489-06-3

Mol F.

: C32H36FNO4

Mol W.

: 517.63

Cat No.

: SA29524

Impurities, Pitavastatin

Pitavastatin Calcium

$80.00 25 mg

Out of Stock

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

Impurities, Pitavastatin

Pitavastatin Desfluoro Acetonide t-Butyl Ester

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Out of Stock

CAS No.

: NA

Mol F.

: C32H37NO4

Mol W.

: 499.64

Cat No.

: SA29511

Impurities, Pitavastatin

Pitavastatin Desfluoro t-Butyl Ester

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Out of Stock

CAS No.

: NA

Mol F.

: C29H33NO4

Mol W.

: 459.58

Cat No.

: SA29510

Impurities, Pitavastatin

Pitavastatin Ethyl Ester

$195.00 25 mg

Out of Stock

CAS No.

: 167073-19-0

Mol F.

: C27H28FNO4

Mol W.

: 449.51

Cat No.

: SA29513

Impurities, Pitavastatin

Pitavastatin Hydroxymethyl

Please enquire for price & pack size

Out of Stock

CAS No.

: 121660-11-5

Mol F.

: C₁₉H₁₆FNO

Mol W.

: 293.33

Cat No.

: SA29516

Impurities, Pitavastatin

Pitavastatin Methylbenzylamine | CAS : 147511-70-4

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Out of Stock

CAS No.

: 147511-70-4

Mol F.

: C33H35FN2O4

Mol W.

: 542.64

Cat No.

: SA29528

Impurities, Pravastatin

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

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Out of Stock

CAS No.

: 1611499-16-1

Mol F.

: C25H24FNO5

Mol W.

: 437.46

Cat No.

: SA29527

Impurities, Pantoprazole

Prantoprazole EP Impurity E

Please enquire for price & pack size

Out of Stock

CAS No.

: 2115779-15-0

Mol F.

: C32H28F4N6O8S2

Mol W.

: 764.72

Cat No.

: SA29105

Impurities, Pantoprazole

Prantoprazole EP Impurity F

Please enquire for price & pack size

Out of Stock

CAS No.

: 721924-06-7

Mol F.

: C17H17F2N3O4S

Mol W.

: 397.4

Cat No.

: SA29106

Impurities, Pravastatin

Pravastatin Lactone

Please enquire for price & pack size

Out of Stock

CAS No.

: 85956-22-5

Mol F.

: C23H34O6

Mol W.

: 406.51

Cat No.

: SA10801

Impurities, Praziquantel

Praziquantel

Please enquire for price & pack size

Out of Stock

CAS No.

: 55268-74-1

Mol F.

: C19H24N2O2

Mol W.

: 312.41

Cat No.

: SA13908

Impurities, Nitrosamine

Praziquantel nitrosamine impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: NA

Mol F.

: C12H13N3O2

Mol W.

: 231.25

Cat No.

: SA44608

Impurities, Prazosin

Prazosin EP Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 23680-84-4

Mol F.

: C10H10ClN3O2

Mol W.

: 239.66

Cat No.

: SA24200

Impurities, Prazosin

Prazosin EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 60547-97-9

Mol F.

: C14H19N5O2

Mol W.

: 289.33

Cat No.

: SA24202

Impurities, Prazosin

Prazosin EP Impurity D

Please enquire for price & pack size

Out of Stock

CAS No.

: 40172-95-0

Mol F.

: C9H12N2O2

Mol W.

: 180.2

Cat No.

: SA24203

Impurities, Prednisolone

Prednienic Acid

$125.00 25 mg

Out of Stock

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

Out of Stock

CAS No.

Mol F.

Mol W.

: 446.53

Cat No.

: SA16718