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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, Levonorgestrel

Levonorgestrel EP Impurity L

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In Stock

CAS No.

: 21800-83-9

Mol F.

: C19H26O2

Mol W.

: 286.41000000000003

Cat No.

: SA23714

Impurities, Levonorgestrel

Levonorgestrel EP Impurity M

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In Stock

CAS No.

: 51087-61-7

Mol F.

: C₂₁H₂₆O₂

Mol W.

: 310.43

Cat No.

: SA23715

Impurities, Levonorgestrel

Levonorgestrel EP Impurity U

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In Stock

CAS No.

: 68-22-4

Mol F.

: C₂₀H₂₆O₂

Mol W.

: 298.42

Cat No.

: SA23723

Impurities, Levonorgestrel

Levonorgestrel EP Impurity V

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In Stock

CAS No.

: 14009-70-2

Mol F.

: C₂₂H₂₈O₂

Mol W.

: 324.45999999999998

Cat No.

: SA23724

Impurities, Levonorgestrel

Levonorgestrel EP Impurity W

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In Stock

CAS No.

: 155683-59-3

Mol F.

: C₂₂H₂₆O

Mol W.

: 306.44

Cat No.

: SA23725

Impurities, Levothyroxine

Levothyroxine N-Acetyl Impurity

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In Stock

CAS No.

: 26041-51-0

Mol F.

: C17H13I4NO5

Mol W.

: 818.91

Cat No.

: SA24700

Impurities, Levothyroxine

Levothyroxine N-Methylamide

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In Stock

CAS No.

: 2088032-52-2

Mol F.

: C16H14I4N2O3

Mol W.

: 789.91

Cat No.

: SA24720

Impurities, Linagliptin

Linagliptin Bromo Impurity

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In Stock

CAS No.

: 1446263-39-3

Mol F.

: C25H29BrN8O2

Mol W.

: 553.45

Cat No.

: SA49915

Impurities, Linagliptin

Linagliptin Impurity 13

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In Stock

CAS No.

: 2279114-31-5

Mol F.

: C20H18BrN5O4

Mol W.

: 472.3

Cat No.

: SA49924

Impurities, Linagliptin

Linagliptin Impurity 18

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In Stock

CAS No.

: 1646355-34-1

Mol F.

: C22H23N7O2

Mol W.

: 417.46

Cat No.

: SA49912

Impurities, Linagliptin

Linagliptin Impurity 20

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In Stock

CAS No.

: 2514949-81-4

Mol F.

: C20H28N4O2

Mol W.

: 356.46

Cat No.

: SA49938

Impurities, Linagliptin

Linagliptin Impurity 21

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In Stock

CAS No.

: 666816-91-7

Mol F.

: C20H28N6O4

Mol W.

: 416.47

Cat No.

: SA49935

Impurities, Linagliptin

Linagliptin Impurity 31

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In Stock

CAS No.

Mol F.

: C30H36N8O3

Mol W.

: 556.7

Cat No.

: SA49925

Impurities, Linagliptin

Linagliptin Impurity 32

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In Stock

CAS No.

: 853029-57-9

Mol F.

: C20H17BrN6O2

Mol W.

: 453.29

Cat No.

: SA49930

Impurities, Linagliptin

Linagliptin Impurity 35

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In Stock

CAS No.

: 2443735-53-1

Mol F.

: C38H42N10O4

Mol W.

: 702.81

Cat No.

: SA49916

Impurities, Linagliptin

Linagliptin Impurity 36

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In Stock

CAS No.

: 2074688-82-5

Mol F.

: C58H58N16O6

Mol W.

: 1075.2

Cat No.

: SA49927

Impurities, Linagliptin

Linagliptin Impurity 44

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In Stock

CAS No.

: 1791405-13-4

Mol F.

: C15H20N6O2

Mol W.

: 316.47

Cat No.

: SA49934

Impurities, Linagliptin

Linagliptin Impurity 49

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In Stock

CAS No.

: 2468656-63-3

Mol F.

: C21H21N7O2

Mol W.

: 403.4

Cat No.

: SA49919

Impurities, Linagliptin

Linagliptin impurity 5

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In Stock

CAS No.

: 2253964-85-9

Mol F.

: C25H28N8O2

Mol W.

: 472.54

Cat No.

: SA49921

Impurities, Linagliptin

Linagliptin Impurity 55

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In Stock

CAS No.

: 2436762-89-7

Mol F.

: C14H13BrN4O2

Mol W.

: 349.2

Cat No.

: SA49928

Impurities, Linagliptin

Linagliptin Impurity 57

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In Stock

CAS No.

Mol F.

: C20H18Br2N6O2

Mol W.

: 534.2

Cat No.

: SA49941

Impurities, Linagliptin

Linagliptin Impurity 69

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In Stock

CAS No.

: 2444011-29-2

Mol F.

: C34H34N8O5

Mol W.

: 634.68

Cat No.

: SA49939

Impurities, Linagliptin

Linagliptin Impurity 72

Please enquire for price & pack size

In Stock

CAS No.

: 2074688-80-3

Mol F.

: C35H37N9O5

Mol W.

: 663.7

Cat No.

: SA49942

Impurities, Linagliptin

Linagliptin Impurity B

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In Stock

CAS No.

: 2138392-83-1

Mol F.

: C26H21BrN8O2

Mol W.

: 557.41

Cat No.

: SA49906

Impurities, Linagliptin

Linagliptin Impurity K

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In Stock

CAS No.

: 141-43-5

Mol F.

: C2H7NO

Mol W.

: 61.08

Cat No.

: SA49913

Impurities, Linagliptin

Linagliptin ImpurityIII/Diquinazolinyl linagliptin

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C31H32N10O2

Mol W.

: 576.65

Cat No.

: SA49932

Impurities, Linagliptin

Linagliptin N-Acetyl Impurity

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In Stock

CAS No.

: 1803079-49-3

Mol F.

: C27H30N8O3

Mol W.

: 514.58

Cat No.

: SA49901

Impurities, Linagliptin

Linagliptin N-Formyl Impurity

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In Stock

CAS No.

: 2137744-33-1

Mol F.

: C26H28N8O3

Mol W.

: 500.55

Cat No.

: SA49907

Impurities, Linagliptin

Linagliptin Phthalimide Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 886588-63-2

Mol F.

: C33H30N8O4

Mol W.

: 602.7

Cat No.

: SA49909

Impurities, Linagliptin

Linagliptin Regio Isomer

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In Stock

CAS No.

: 1446263-38-2

Mol F.

: C25H28N8O2

Mol W.

: 472.54

Cat No.

: SA49940

Impurities, Linagliptin

Linagliptin Related Compound A

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In Stock

CAS No.

: 666816-98-4

Mol F.

: C10H9BrN4O2

Mol W.

: 297.1

Cat No.

: SA49922

Impurities, Linagliptin

Linagliptin S-Isomer

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In Stock

CAS No.

: 668270-11-9

Mol F.

: C25H28N8O2

Mol W.

: 472.54

Cat No.

: SA49902

Clindamycin, Impurities

Lincomycin

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In Stock

CAS No.

: 154-21-2

Mol F.

: C₁₈H₃₄N₂O₆S

Mol W.

: 406.54

Cat No.

: SA29705

Clindamycin, Impurities

Lincomycin EP Impurity F

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In Stock

CAS No.

: 14810-93-6

Mol F.

: C9H19NO5S

Mol W.

: 253.32

Cat No.

: SA29714

Clindamycin, Impurities

Lincomycin Hydrochloride EP Impurity D

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In Stock

CAS No.

: 26389-84-4

Mol F.

: C18H35ClN2O6S

Mol W.

: 443

Cat No.

: SA29717

Impurities, Linezolid

Linezolid Amine Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 93246-53-8

Mol F.

: C₁₀H₁₃FN₂O

Mol W.

: 196.22

Cat No.

: SA17516

Impurities, Linezolid

Linezolid Desacetamide Descarbonyl Phthalimide (R)-Isomer

Please enquire for price & pack size

In Stock

CAS No.

: 874340-08-6

Mol F.

: C21H22FN3O4

Mol W.

: 399.42

Cat No.

: SA17521

Impurities, Linezolid

Linezolid Diphthalimide

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In Stock

CAS No.

: 1798014-14-8

Mol F.

: C32H31FN4O7

Mol W.

: 602.61

Cat No.

: SA17520

Impurities, Linezolid

Linezolid Diphthalimide Methyl Carbamate Dimer

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C36H35FN4O11

Mol W.

: 718.68

Cat No.

: SA17522

Impurities, Linezolid

Linezolid Diphthalimide Methyl Carbamate Monomer

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In Stock

CAS No.

Mol F.

: C34H33FN4O9

Mol W.

: 660.65

Cat No.

: SA17523

Impurities, Linezolid

Linezolid hydroxy intermediate

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

Mol W.

Cat No.

: SA17519

Impurities, Linezolid

Linezolid USP RC D

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In Stock

CAS No.

: 2180621-71-8

Mol F.

: C₁₅H₁₉FN₂O₆S

Mol W.

: 374.38

Cat No.

: SA17518

Impurities, Lisinopril

Lisinopril (S,S,R)-Diketopiperazine

$225.00 25 mg

In Stock

CAS No.

: 219677-82-4

Mol F.

: C21H29N3O4

Mol W.

: 387.47

Cat No.

: SA35704

Impurities, Lisinopril

Lisinopril Cyclohexyl Impurity

$495.00 25 mg

In Stock

CAS No.

: 1132650-67-9

Mol F.

: C21H37N3O5

Mol W.

: 411.54

Cat No.

: SA35706

Impurities, Lisinopril

Lisinopril Diketopiperazine Impurity

$275.00 25 mg

In Stock

CAS No.

: 328385-86-0

Mol F.

: C21H29N3O4

Mol W.

: 387.47

Cat No.

: SA35703

Impurities, Ursodiol

Lithocholic Acid

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In Stock

CAS No.

: 434-13-9

Mol F.

: C24H40O3

Mol W.

: 376.57

Cat No.

: SA31203

Impurities, Loratadine

Loratadine 2-Acid

$495.00 25 mg

In Stock

CAS No.

Mol F.

: C23H23ClN2O4

Mol W.

: 426.89

Cat No.

: SA34027

Impurities, Loratadine

Loratadine 2-Hydroxymethyl Impurity

$595.00 25 mg

In Stock

CAS No.

: 609806-39-5

Mol F.

: C23H25ClN2O3

Mol W.

: 412.91

Cat No.

: SA34015

Impurities, Loratadine

Loratadine 2-Methyl Ester

$395.00 25 mg

In Stock

CAS No.

: 860010-37-3

Mol F.

: C24H25ClN2O4

Mol W.

: 440.92

Cat No.

: SA34029

Impurities, Loratadine

Loratadine 2-Nitrile

$155.00 25 mg

In Stock

CAS No.

: 860010-31-7

Mol F.

: C23H22ClN3O2

Mol W.

: 407.89

Cat No.

: SA34028