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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, Lamivudine

Lamivudine EP Impurity I

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CAS No.

: 145918-75-8

Mol F.

: C8H11N3O4

Mol W.

: 213.19

Cat No.

: SA22313

Impurities, Lamivudine

Lamivudine N-Hydroxymethyl Impurity

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CAS No.

: 1904611-13-7

Mol F.

: C9H13N3O4S

Mol W.

: 259.3

Cat No.

: SA22325

Impurities, Lamivudine

Lamivudine Resolution Mixture A

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CAS No.

Mol F.

: C8H11N3O3S

Mol W.

: 229.26

Cat No.

: SA22324

Impurities, Lamivudine

Lamivudine S-Oxide

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CAS No.

: 1235712-40-9

Mol F.

: C₈H₁₁N₃O₄S

Mol W.

: 245.26

Cat No.

: SA22304

Impurities, Lamivudine

Lamivudine USP Related compound A

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CAS No.

: NA

Mol F.

: C8H9N3O4S

Mol W.

: 243.24

Cat No.

: SA22317

Impurities, Lamotrigine

Lamotrigine

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CAS No.

: 84057-84-1

Mol F.

: C₉H₇Cl₂N₅

Mol W.

: 256.1

Cat No.

: SA28007

Impurities, Lamotrigine

Lamotrigine 3,3-Dimer

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CAS No.

: 1797983-48-2

Mol F.

: C₁₉H₁₄Cl₄N₁₀

Mol W.

: 524.19

Cat No.

: SA28008

Impurities, Lamotrigine

Lamotrigine EP Impurity A

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CAS No.

: 252186-78-0

Mol F.

: C9H6Cl2N4O

Mol W.

: 257.07

Cat No.

: SA28000

Impurities, Lamotrigine

Lamotrigine EP Impurity B

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CAS No.

: 94213-24-8

Mol F.

: C9H7Cl2N5

Mol W.

: 256.08999999999997

Cat No.

: SA28001

Impurities, Lamotrigine

Lamotrigine EP Impurity C

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CAS No.

: 84689-20-3

Mol F.

: C9H7Cl2N5

Mol W.

: 256.09

Cat No.

: SA28002

Impurities, Lamotrigine

Lamotrigine EP Impurity D

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CAS No.

: 661463-79-2

Mol F.

: C9H5Cl2N3O2

Mol W.

: 258.06

Cat No.

: SA28003

Impurities, Lamotrigine

Lamotrigine EP Impurity E

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CAS No.

: 50-45-3

Mol F.

: C7H4Cl2O2

Mol W.

: 191.01

Cat No.

: SA28004

Impurities, Lamotrigine

Lamotrigine EP Impurity F

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CAS No.

: 252186-79-1

Mol F.

: C16H9Cl4N5O

Mol W.

: 429.09

Cat No.

: SA28005

Impurities, Lamotrigine

Lamotrigine EP Impurity G

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CAS No.

: 38943-76-9

Mol F.

: C₉H₇Cl₂N₅

Mol W.

: 256.09

Cat No.

: SA28006

Impurities, Lansoprazole

Lansoprazole

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CAS No.

: 103577-45-3

Mol F.

: C16H14F3N3O2S

Mol W.

: 369.36

Cat No.

: SA35900

Impurities, Lansoprazole

Lansoprazole 4-Nitro Impurity

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CAS No.

: 142384-07-4

Mol F.

: C14H12N4O3S

Mol W.

: 316.33999999999997

Cat No.

: SA35911

Impurities, Lansoprazole

Lansoprazole 5-Hydroxy Impurity

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CAS No.

: 131926-98-2;1329613-29-7(potassiumsalt)

Mol F.

: C16H14F3N3O3S

Mol W.

: 385.36

Cat No.

: SA35917

Impurities, Lansoprazole

Lansoprazole Chloromethyl Impurity

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CAS No.

: 127337-60-4

Mol F.

: C9H9ClF3NO

Mol W.

: 239.62

Cat No.

: SA35908

Impurities, Lansoprazole

Lansoprazole EP Impurity F

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CAS No.

: 168167-42-8

Mol F.

: C14H12ClN3OS

Mol W.

: 305.77999999999997

Cat No.

: SA35906

Impurities, Lansoprazole

Lansoprazole Hydroxymethyl Impurity

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CAS No.

: 103577-66-8

Mol F.

: C9H10F3NO2

Mol W.

: 221.18

Cat No.

: SA35916

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 B | CAS : 60-18-4

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CAS No.

: 60-18-4

Mol F.

: C9H11NO3

Mol W.

: 181.2

Cat No.

: SA31817

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