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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, Nintedanib

Nintedanib Esylate Impurity B

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CAS No.

: NA

Mol F.

: C32H35N5O4

Mol W.

: 553.65

Cat No.

: SA22533

Impurities, Nintedanib

Nintedanib Esylate Impurity C | CAS : 2519501-85-8

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CAS No.

: 519501-85-8

Mol F.

: C23H18N2O4

Mol W.

: 386.40

Cat No.

: SA22534

Impurities, Nintedanib

Nintedanib Esylate Impurity E | CAS : 2380229-45-6

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CAS No.

: 2380229-45-6

Mol F.

: C33H35N5O5

Mol W.

: 581.66

Cat No.

: SA22535

Impurities, Nintedanib

Nintedanib Ethoxy Enolindole

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CAS No.

: 656247-19-7

Mol F.

: C19H17NO4

Mol W.

: 323.3

Cat No.

: SA22522

Impurities, Nintedanib

Nintedanib ethyl ester impurity

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CAS No.

Mol F.

: C32H35N5O4

Mol W.

: 553.66

Cat No.

: SA22523

Impurities, Nintedanib

Nintedanib N-Acyl Ethoxy Enolindole

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CAS No.

: 1175365-43-1

Mol F.

: C21H19NO5

Mol W.

: 365.38

Cat No.

: SA22526

Impurities, Nintedanib

Nintedanib N-Acyl Oxindole

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CAS No.

: 676326-36-6

Mol F.

: C12H11NO4

Mol W.

: 233.22

Cat No.

: SA22524

Impurities, Nintedanib

Nintedanib N-Acyl-4-carboxylate

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CAS No.

: NA

Mol F.

: C12H11NO4

Mol W.

: 233.22

Cat No.

: SA22536

Impurities, Nintedanib

Nintedanib N, N-Dimethyl Amine

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CAS No.

: 2454314-41-9

Mol F.

: C19H18N2O3

Mol W.

: 322.4

Cat No.

: SA22521

Impurities, Nintedanib, Nitrosamine

Nintedanib Nitroso Impurity 1

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CAS No.

Mol F.

: C31H32N6O5

Mol W.

: 568.62

Cat No.

: SA22530

Impurities, Nintedanib

Nintedanib Piperazinyl N’- oxide

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CAS No.

Mol F.

: C31H35N5O5

Mol W.

: 557.64

Cat No.

: SA22528

Impurities, Niraparib

Niraparib carboxylic acid metabolite M1

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CAS No.

: 1476777-06-6

Mol F.

: C19H19N3O2

Mol W.

: 321.37

Cat No.

: SA50601

Impurities, Niraparib

Niraparib HCl

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CAS No.

: 1038915-64-8

Mol F.

: C19H21ClN4O

Mol W.

: 356.85

Cat No.

: SA50600

Impurities, Niraparib

Niraparib Impurity B

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CAS No.

Mol F.

: C24H28N4O3

Mol W.

: 420.5

Cat No.

: SA50602

Impurities, Niraparib

Niraparib Impurity E

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CAS No.

Mol F.

: C19H18N4O

Mol W.

: 318.37

Cat No.

: SA50603

Impurities, Nirmatrelvir

Nirmatrelvir

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CAS No.

: 2628280-40-8

Mol F.

: C23H32F3N5O4

Mol W.

: 499.5

Cat No.

: SA46900

Impurities, Nirmatrelvir

Nirmatrelvir Impurity A

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CAS No.

: 2628280-48-6

Mol F.

: C7H14ClN3O2

Mol W.

: 207.66

Cat No.

: SA46901

Impurities, Nirmatrelvir

Nirmatrelvir Impurity B

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CAS No.

: 2755812-81-6

Mol F.

: C23H34F3N5O5

Mol W.

: 517.6

Cat No.

: SA46902

Impurities, Nirmatrelvir

Nirmatrelvir R-isomer(CN) Impurity

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CAS No.

: 2755812-41-8

Mol F.

: C23H32F3N5O4

Mol W.

: 499.5

Cat No.

: SA46903

Impurities, Lenalidomide

Nitrobenzoate Lenalidomide Impurity

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CAS No.

: 1628915-10-5

Mol F.

: C9H9NO5

Mol W.

: 211.17

Cat No.

: SA34104

Impurities, Nitrofurantoin

Nitrofurantoin

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CAS No.

: 67-20-9

Mol F.

: C8H6N4O5

Mol W.

: 238.16

Cat No.

: SA39800

Impurities, Nitrofurantoin

Nitrofurantoin 4-Hydroxy Impurity

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CAS No.

: 76644-41-2

Mol F.

: C8H6N4O6

Mol W.

: 254.16

Cat No.

: SA39801

Impurities, Nitrofurantoin

Nitrofurantoin 5-Methyl Impurity

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CAS No.

: 3668-93-7

Mol F.

: C9H8N4O5

Mol W.

: 252.18

Cat No.

: SA39802

Impurities, Nitrofurantoin

Nitrofurantoin USP Related Compound A

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CAS No.

: 63981-22-6

Mol F.

: C8H8N4O6

Mol W.

: 256.17

Cat No.

: SA39803

Impurities, Nitrofurantoin

Nitrofurate

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CAS No.

: 645-12-5

Mol F.

: C5H3NO5

Mol W.

: 157.08

Cat No.

: SA39804

Impurities, Nitrofurantoin

Nitrofurazone

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CAS No.

: 59-87-0

Mol F.

: C†H†N„O„

Mol W.

: 198.14

Cat No.

: SA39808

Impurities, Nitrosamine

Nitrosamine impurity for Torsemide

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CAS No.

: NA

Mol F.

: C16H19N5O4S

Mol W.

: 277.12

Cat No.

: SA44612

Atorvastatin, Impurities, Nitrosamine

Nitrosamine impurity of Atorvastatin Calcium

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CAS No.

: NA

Mol F.

: C33H34FN3O6

Mol W.

: 587.64

Cat No.

: SA44613

Carvedilol, Impurities, Nitrosamine

Nitroso Carvedilol

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CAS No.

Mol F.

: C24H25N3O5

Mol W.

: 435.5

Cat No.

: SA31721

Impurities, Nizatidine

Nizatidine

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CAS No.

: 76963-41-2

Mol F.

: C12H21N5O2S2

Mol W.

: 331.46

Cat No.

: SA34400

Impurities, Nizatidine

Nizatidine EP Impurity A

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CAS No.

: 54252-45-8

Mol F.

: C4H9N3O2

Mol W.

: 131.13

Cat No.

: SA34401

Impurities, Nizatidine

Nizatidine EP Impurity B

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CAS No.

: 61832-41-5

Mol F.

: C4H8N2O2S

Mol W.

: 148.18

Cat No.

: SA34402

Impurities, Nizatidine

Nizatidine EP Impurity F

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CAS No.

: NA

Mol F.

: C15H25N7O4S3

Mol W.

: 463.6

Cat No.

: SA34406

Impurities, Nizatidine

Nizatidine EP Impurity G

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CAS No.

: 1193434-63-7

Mol F.

: C20H33N7O2S4

Mol W.

: 531.78

Cat No.

: SA34407

Impurities, Nizatidine

Nizatidine EP Impurity I

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CAS No.

: 82586-81-0

Mol F.

: C11H20N4CS2

Mol W.

: 288.43

Cat No.

: SA34409

Impurities, Nizatidine

Nizatidine EP Impurity K

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CAS No.

: 112233-23-5

Mol F.

: C5H10ClN3OS

Mol W.

: 195.67

Cat No.

: SA34411

Impurities, Nizatidine

Nizatidine N-Oxide

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CAS No.

: NA

Mol F.

: C12H21N5O3S2

Mol W.

: 347.46

Cat No.

: SA34413

Dapoxetine, Impurities

NN-didesmethyl, N-Boc Dapoxetine Impurity

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CAS No.

: 1404234-03-2

Mol F.

: C24H27NO3

Mol W.

: 377.48

Cat No.

: SA23016

Aspirin, Impurities

NO-Aspirin

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CAS No.

: 287118-97-2

Mol F.

: C16H13NO7

Mol W.

: 331.28

Cat No.

: SA28501

19-Norandrostenedione

Norandrostenedione-3-ethyldienol ether

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CAS No.

: 2863-88-9

Mol F.

: C20H28O2

Mol W.

: C20H28O2

Cat No.

: SA15802

Impurities, Norelgestromin

Norelgestromin

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CAS No.

: 53016-31-2

Mol F.

: C21H29NO2

Mol W.

: 327.46

Cat No.

: SA51700

Impurities, Norethindrone

Norethindrone

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CAS No.

: 68-22-4

Mol F.

: C20H26O2

Mol W.

: 298.42

Cat No.

: SA13421

Impurities, Norethindrone

Norethindrone 3-Isopropoxy Impurity

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CAS No.

Mol F.

: C23H32O2

Mol W.

: 340.5

Cat No.

: SA13414

Impurities, Norethindrone

Norethindrone 4,5α-Dihydro Impurity

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CAS No.

: 52-79-9

Mol F.

: C20H28O2

Mol W.

: 300.44

Cat No.

: SA13425

Impurities, Norethindrone

Norethindrone Acetate

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CAS No.

: 51-98-9

Mol F.

: C22H28O3

Mol W.

: 340.46

Cat No.

: SA13419

Impurities, Norethindrone

Norethindrone Acetate EP Impurity D

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CAS No.

Mol F.

: C24H30O4

Mol W.

: 382.49

Cat No.

: SA13420

Impurities, Norethindrone

Norethindrone EP Impurity D; Δ-5(10)-Norethindrone Acetate

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CAS No.

: 68-23-5

Mol F.

: C20H26O2

Mol W.

: 298.42

Cat No.

: SA13423

Impurities, Norethindrone

Norethindrone EP Impurity F; Norethindrone 3-Ethyl Ether

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CAS No.

: 96487-85-3

Mol F.

: C22H30O2

Mol W.

: 326.47

Cat No.

: SA13413

Impurities, Norethindrone

Norethindrone Sulfate Sodium Salt

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CAS No.

: 19778-24-6

Mol F.

: C20H25NaO5S

Mol W.

: 400.46

Cat No.

: SA13428

Impurities, Norethindrone

Norethisterone Acetate Impurity J

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CAS No.

: 734-32-7

Mol F.

: C18H24O2

Mol W.

: 272.38

Cat No.

: SA13418