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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, Lansoprazole

Lansoprazole N-Oxide; Lansoprazole EP Impurity A

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CAS No.

: 213476-12-1

Mol F.

: C16H14F3N3O3S

Mol W.

: 385.36

Cat No.

: SA35901

Impurities, Lansoprazole

Lansoprazole Nitro Impurity

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CAS No.

: 37699-43-7

Mol F.

: C7H8N2O3

Mol W.

: 168.15

Cat No.

: SA35907

Impurities, Lansoprazole

Lansoprazole R-Isomer

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CAS No.

: 138530-94-6

Mol F.

: C16H14F3N3O2S

Mol W.

: 369.36

Cat No.

: SA35913

Impurities, Lansoprazole

Lansoprazole S-Isomer

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CAS No.

: 138530-95-7

Mol F.

: C16H14F3N3O2S

Mol W.

: 369.36

Cat No.

: SA35914

Impurities, Lansoprazole

Lansoprazole Sulfide 4-Hydroxy Impurity

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CAS No.

: 131926-97-1

Mol F.

: C14H13N3OS

Mol W.

: 271.33999999999997

Cat No.

: SA35912

Impurities, Lansoprazole

Lansoprazole Sulfide N-Oxide Impurity

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CAS No.

: 163119-30-0

Mol F.

: C16H14F3N3O2S

Mol W.

: 369.36

Cat No.

: SA35909

Impurities, Lansoprazole

Lansoprazole Sulfide; Lansoprazole EP Impurity C

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CAS No.

: 103577-40-8

Mol F.

: C16H14F3N3OS

Mol W.

: 353.36

Cat No.

: SA35903

Impurities, Lansoprazole

Lansoprazole Sulfone N-Oxide Impurity

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CAS No.

: 953787-54-7

Mol F.

: C16H14F3N3O4S

Mol W.

: 401.36

Cat No.

: SA35910

Impurities, Lansoprazole

Lansoprazole Sulfone; Lansoprazole EP Impurity B

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CAS No.

: 131926-99-3

Mol F.

: C16H14F3N3O3S

Mol W.

: 385.36

Cat No.

: SA35902

Impurities, Lansoprazole

Lansoprazole Thioxo Impurity

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CAS No.

: 1246819-06-6

Mol F.

: C14H9N3OS

Mol W.

: 267.31

Cat No.

: SA35915

Impurities, Leflunomide

Leflunomide

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CAS No.

: 75706-12-6

Mol F.

: C12H9F3N2O2

Mol W.

: 270.20999999999998

Cat No.

: SA21800

Impurities, Leflunomide

Leflunomide EP Impurity C

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CAS No.

: 61643-23-0

Mol F.

: C12H9F3N2O2

Mol W.

: 270.20999999999998

Cat No.

: SA21803

Impurities, Leflunomide

Leflunomide EP Impurity D

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CAS No.

: 42831-50-5

Mol F.

: C5H5NO3

Mol W.

: 127.1

Cat No.

: SA21804

Impurities, Leflunomide

Leflunomide EP Impurity E

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CAS No.

: 208401-20-1

Mol F.

: C12H9F3N2O2

Mol W.

: 270.20999999999998

Cat No.

: SA21805

Impurities, Leflunomide

Leflunomide EP Impurity F

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CAS No.

: 1403564-06-6

Mol F.

: C12H9F3N2O2

Mol W.

: 270.20999999999998

Cat No.

: SA21806

Impurities, Leflunomide

Leflunomide EP Impurity G

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CAS No.

: 724429-16-7

Mol F.

: C12H12N2O2

Mol W.

: 216.24

Cat No.

: SA21807

Impurities, Leflunomide

Leflunomide EP Impurity H

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CAS No.

: 24522-30-3

Mol F.

: C10H7F3N2O

Mol W.

: 228.17

Cat No.

: SA21808

Impurities, Lenalidomide

Lenalidomide

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CAS No.

: 191732-72-6

Mol F.

: C13H13N3O3

Mol W.

: 259.26

Cat No.

: SA34100

Impurities, Lercanidipine

Lercanidipine Dimer Impurity

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CAS No.

Mol F.

: C55H64N4O6

Mol W.

: 877.12

Cat No.

: SA50908

Impurities, Lercanidipine

Lercanidipine EP Impurity D

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CAS No.

: 210579-71-8

Mol F.

: C37H43N3O6.HCl

Mol W.

: 662.21

Cat No.

: SA50906

Impurities, Lercanidipine

Lercanidipine Hydrochloride

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CAS No.

: 132866-11-6

Mol F.

: C36H42ClN3O6

Mol W.

: 648.19

Cat No.

: SA50900

Impurities, Lercanidipine

Lercanidipine Impurity A

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CAS No.

: 74936-74-6

Mol F.

: C19H22N2O6

Mol W.

: 374.39

Cat No.

: SA50901

Impurities, Lercanidipine

Lercanidipine Impurity C

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CAS No.

: 1797124-83-4

Mol F.

: C38H45N3O6

Mol W.

: 639.78

Cat No.

: SA50905

Impurities, Levetiracetam

Levetiracetam EP Impurity G

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CAS No.

: 7682-20-4

Mol F.

: C4H11ClN2O

Mol W.

: 138.6

Cat No.

: SA46000

Carbidopa, Impurities

Levodopa EP Impurity-D

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CAS No.

: 5796-17-8

Mol F.

: C9H11NO4

Mol W.

: 197.19

Cat No.

: SA31812

Impurities, Levofloxacin

Levofloxacin

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CAS No.

: 138199-71-0(hemihydrate); 100986-85-4(Anhydrous)

Mol F.

: C18H20FN3O4 • 1/2H2O

Mol W.

: 370.39

Cat No.

: SA18400

Impurities, Levofloxacin

Levofloxacin Desethylene Diformyl Impurity

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CAS No.

: 151377-74-1

Mol F.

: C18H18FN3O6

Mol W.

: 391.35

Cat No.

: SA18411

Impurities, Levofloxacin

Levofloxacin Desfluoro 2-Methyl Analog

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CAS No.

: NA

Mol F.

: C18H21N3O4

Mol W.

: 343.38

Cat No.

: SA18410

Impurities, Levofloxacin

Levofloxacin Diamine Impurity | CAS : 1797510-34-9

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CAS No.

: 1797510-34-9

Mol F.

: C15H16FN3O4

Mol W.

: 321.30

Cat No.

: SA18412

Impurities, Levofloxacin

Levofloxacin EP Impurity A

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CAS No.

: 100986-86-5

Mol F.

: C18H20FN3O4

Mol W.

: 361.37

Cat No.

: SA18406

Impurities, Levofloxacin

Levofloxacin EP Impurity C

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CAS No.

: 117678-38-3

Mol F.

: C18H20FN3O5

Mol W.

: 377.37

Cat No.

: SA18408

Impurities, Levofloxacin

Levofloxacin EP Impurity D

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CAS No.

: 117620-85-6(base)

Mol F.

: C18H22ClN3O4 (HCl)

Mol W.

: 379.84

Cat No.

: SA18409

Impurities, Levofloxacin

Levofloxacin EP Impurity E

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CAS No.

: 178964-53-9

Mol F.

: C17H20FN3O2

Mol W.

: 317.36

Cat No.

: SA18403

Impurities, Levofloxacin

Levofloxacin EP Impurity G

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CAS No.

: 1346603-62-0

Mol F.

: C16H19ClFN3O4

Mol W.

: 371.79

Cat No.

: SA18407

Impurities, Levofloxacin

Levofloxacin EP Impurity H

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CAS No.

: 177472-30-9

Mol F.

: C20H24FN3O4

Mol W.

: 389.42

Cat No.

: SA18404

Impurities, Levofloxacin

Levofloxacin EP Impurity I

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CAS No.

: 178912-62-4(base)

Mol F.

: C18H21ClFN3O4 (HCl)

Mol W.

: 397.83

Cat No.

: SA18405

Impurities, Levomilnacipran

Levomilnacipran

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CAS No.

: 96847-55-1

Mol F.

: C11H13NO2

Mol W.

: 191.23

Cat No.

: SA29200

Impurities, Levonorgestrel

Levonorgestrel

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CAS No.

: 797-63-7

Mol F.

: C₂₁H₂₈O₂

Mol W.

: 312.45

Cat No.

: SA23703

Impurities, Levonorgestrel

Levonorgestrel 3-Ethyldienol Ether

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CAS No.

: 24908-87-0

Mol F.

: C23H32O2

Mol W.

: 340.5

Cat No.

: SA23700

Impurities, Levonorgestrel

Levonorgestrel 5α-Dihydro Impurity

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CAS No.

: 78088-19-4

Mol F.

: C21H30O2

Mol W.

: 314.45999999999998

Cat No.

: SA23701

Impurities, Levonorgestrel

Levonorgestrel 6-Hydroxy Impurity

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CAS No.

: 40915-05-7

Mol F.

: C21H28O3

Mol W.

: 328.45

Cat No.

: SA23702

Impurities, Levonorgestrel

Levonorgestrel Acetate

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CAS No.

: 13732-69-9

Mol F.

: C₂₃H₃₀O₃

Mol W.

: 354.48

Cat No.

: SA23704

Impurities, Levonorgestrel

Levonorgestrel Acetate Delta-5 Impurity

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CAS No.

: 1175110-92-5

Mol F.

: C23H30O3

Mol W.

: 354.48

Cat No.

: SA23705

Impurities, Levonorgestrel

Levonorgestrel EP Impurity A

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CAS No.

: 1260525-53-8

Mol F.

: C21H26O2

Mol W.

: 310.43

Cat No.

: SA23706

Impurities, Levonorgestrel

Levonorgestrel EP Impurity D

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CAS No.

: 32419-58-2

Mol F.

: C₂₁H₃₀O

Mol W.

: 298.45999999999998

Cat No.

: SA23709

Impurities, Levonorgestrel

Levonorgestrel EP Impurity N

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CAS No.

: 4222-96-2

Mol F.

: C₁₉H₂₆O₂

Mol W.

: 286.41000000000003

Cat No.

: SA23716

Impurities, Levonorgestrel

Levonorgestrel EP Impurity O

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CAS No.

: 155683-60-6

Mol F.

: C22H32O3

Mol W.

: 344.49

Cat No.

: SA23717

Impurities, Levonorgestrel

Levonorgestrel EP Impurity P

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CAS No.

: 100021-05-4

Mol F.

: C₂₁H₂₈O₂

Mol W.

: 312.45

Cat No.

: SA23718

Impurities, Levonorgestrel

Levonorgestrel EP Impurity Q

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CAS No.

: 1038-28-4

Mol F.

: C20H30O2

Mol W.

: 302.45

Cat No.

: SA23719

Impurities, Levonorgestrel

Levonorgestrel EP Impurity R

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CAS No.

: 2322-77-2

Mol F.

: C₂₀H₂₈O₂

Mol W.

: 300.44

Cat No.

: SA23720