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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, Levonorgestrel

Levonorgestrel EP Impurity S

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CAS No.

: 176254-10-7

Mol F.

: C₂₂H₃₀O₂

Mol W.

: 326.47000000000003

Cat No.

: SA23721

Impurities, Levonorgestrel

Levonorgestrel EP Impurity T

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CAS No.

: 799-43-9

Mol F.

: C22H30O2

Mol W.

: 326.47000000000003

Cat No.

: SA23722

Impurities, Sulpiride

Levosulpiride

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CAS No.

: 23672-07-3

Mol F.

: C15H23N3O4S

Mol W.

: 341.43

Cat No.

: SA10908

Impurities, Sulpiride

Levosulpiride EP impurity A

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CAS No.

: 22795-99-9

Mol F.

: C7H16N2

Mol W.

: 128.22

Cat No.

: SA10911

Impurities, Levothyroxine

Levothyroxine Acetamide Impurity

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CAS No.

: 176258-88-1

Mol F.

: C14H9I4NO3

Mol W.

: 746.84

Cat No.

: SA24701

Impurities, Levothyroxine

Levothyroxine beta-Hydroxy Impurity

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CAS No.

: 107849-54-7

Mol F.

: C15H11I4NO5

Mol W.

: 792.87

Cat No.

: SA24702

Impurities, Levothyroxine

Levothyroxine D-Isomer

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CAS No.

: 51-49-0

Mol F.

: C15H11I4NO4

Mol W.

: 776.87

Cat No.

: SA24703

Impurities, Levothyroxine

Levothyroxine EP Impurity A

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CAS No.

: 6893-02-3

Mol F.

: C15H12I3NO4

Mol W.

: 650.97

Cat No.

: SA24704

Impurities, Levothyroxine

Levothyroxine EP Impurity B

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CAS No.

: 1628720-66-0

Mol F.

: C15H11ClI3NO4

Mol W.

: 685.42

Cat No.

: SA24705

Impurities, Levothyroxine

Levothyroxine EP Impurity C

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CAS No.

: 51-24-1

Mol F.

: C14H9I3O4

Mol W.

: 621.92999999999995

Cat No.

: SA24706

Impurities, Levothyroxine

Levothyroxine EP Impurity D

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CAS No.

: 67-30-1

Mol F.

: C14H8I4O4

Mol W.

: 747.83

Cat No.

: SA24707

Impurities, Levothyroxine

Levothyroxine EP Impurity E

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CAS No.

: 1041-01-6

Mol F.

: C15H13I2NO4

Mol W.

: 525.08000000000004

Cat No.

: SA24708

Impurities, Levothyroxine

Levothyroxine EP Impurity F

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CAS No.

: 911661-90-0

Mol F.

: C21H13I6NO5

Mol W.

: 1120.76

Cat No.

: SA24709

Impurities, Levothyroxine

Levothyroxine EP Impurity H

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CAS No.

: 2055-97-2

Mol F.

: C13H6I4O4

Mol W.

: 733.8

Cat No.

: SA24710

Impurities, Levothyroxine

Levothyroxine EP Impurity I

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CAS No.

: 2016-06-0

Mol F.

: C13H6I4O3

Mol W.

: 717.8

Cat No.

: SA24711

Impurities, Levothyroxine

Levothyroxine EP Impurity J

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CAS No.

: 4604-41-5

Mol F.

: C15H13I2NO4

Mol W.

: 525.08000000000004

Cat No.

: SA24712

Impurities, Levothyroxine

Levothyroxine EP Impurity K

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CAS No.

: 5817-39-0

Mol F.

: C15H12I3NO4

Mol W.

: 650.97

Cat No.

: SA24713

Impurities, Levothyroxine

Levothyroxine Ethyl Ester

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CAS No.

: 76353-71-4

Mol F.

: C17H15I4NO4

Mol W.

: 804.92

Cat No.

: SA24714

Impurities, Levothyroxine

Levothyroxine Hydroxyphenoxy Aldehyde Impurity

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CAS No.

: 2828-49-1

Mol F.

: C13H8I2O3

Mol W.

: 466.01

Cat No.

: SA24715

Impurities, Levothyroxine

Levothyroxine Methoxyphenoxy Aldehyde Impurity

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CAS No.

: 69240-57-9

Mol F.

: C14H10I2O3

Mol W.

: 480.04

Cat No.

: SA24716

Impurities, Levothyroxine

Levothyroxine Methyl Ester

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CAS No.

: 32180-11-3

Mol F.

: C16H13I4NO4

Mol W.

: 790.9

Cat No.

: SA24717

Impurities, Levothyroxine

Levothyroxine Monochloro Impurity

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CAS No.

: 909279-46-5

Mol F.

: C15H11ClI3NO4

Mol W.

: 685.42

Cat No.

: SA24718

Impurities, Levothyroxine

Levothyroxine N-Formyl Impurity

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CAS No.

: 671235-41-9

Mol F.

: C16H11I4NO5

Mol W.

: 804.88

Cat No.

: SA24719

Impurities, Levothyroxine

Levothyroxine O-Methyl Amine Impurity

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CAS No.

: 2230724-39-5

Mol F.

: C15H13I4NO2

Mol W.

: 746.89

Cat No.

: SA24721

Impurities, Levothyroxine

Levothyroxine Sodium

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CAS No.

: 55-03-8

Mol F.

: C15H20I4NNaO9

Mol W.

: 888.93

Cat No.

: SA24722

Impurities, Levothyroxine

Levothyroxine T4-Hydroxyacetic Acid Impurity

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CAS No.

: 93647-48-4

Mol F.

: C14H8I4O5

Mol W.

: 763.83

Cat No.

: SA24723

Impurities, Linagliptin

Linagliptin

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CAS No.

: 668270-12-0

Mol F.

: C25H28N8O2

Mol W.

: 472.54

Cat No.

: SA49933

Impurities, Linagliptin

Linagliptin 2-Chloromethyl Impurity

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CAS No.

: 109113-72-6

Mol F.

: C10H9ClN2

Mol W.

: 192.64

Cat No.

: SA49923

Impurities, Linagliptin

Linagliptin Diene Impurity

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CAS No.

: 2463617-43-6

Mol F.

: C25H28N8O2

Mol W.

: 472.54

Cat No.

: SA49914

Impurities, Linagliptin

Linagliptin Dimer impurity (N-C-C-C Dimer)

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CAS No.

: 2463617-49-2

Mol F.

: C51H56N16O4

Mol W.

: 957.1

Cat No.

: SA49908

Impurities, Linagliptin

Linagliptin Impurity 18

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CAS No.

: 1646355-34-1

Mol F.

: C22H23N7O2

Mol W.

: 417.5

Cat No.

: SA49920

Impurities, Linagliptin

Linagliptin Impurity 21

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CAS No.

: 666816-91-7

Mol F.

: C20H28N6O4

Mol W.

: 416.47

Cat No.

: SA49944

Impurities, Linagliptin

Linagliptin Impurity 32

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CAS No.

: 853029-57-9

Mol F.

: C20H17BrN6O2

Mol W.

: 453.29

Cat No.

: SA49943

Impurities, Linagliptin

Linagliptin Impurity 44

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CAS No.

: 1791405-13-4

Mol F.

: C15H20N6O2

Mol W.

: 316.36

Cat No.

: SA49945

Impurities, Linagliptin

Linagliptin Impurity 55

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CAS No.

: 2436762-89-7

Mol F.

: C14H13BrN4O2

Mol W.

: 349.18

Cat No.

: SA49947

Impurities, Linagliptin

Linagliptin Regio Isomer Di-Nitroso Impurity

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CAS No.

: NA

Mol F.

: C25H26N10O4

Mol W.

: 530.54

Cat No.

: SA49953

Impurities, Linezolid

Linezolid

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CAS No.

: 165800-03-3

Mol F.

: C16H20FN3O4

Mol W.

: 337.35

Cat No.

: SA17501

Impurities, Linezolid

Linezolid Benzyl Ester Impurity

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CAS No.

: 168828-81-7

Mol F.

: C18H19FN2O3

Mol W.

: 330.35

Cat No.

: SA17517

Impurities, Linezolid

Linezolid Dimer

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CAS No.

: 908143-04-4

Mol F.

: C₃₀H₃₅F₂N₅O₇

Mol W.

: 615.62

Cat No.

: SA17515

Impurities, Linezolid

Linezolid Fluoromorpholino Oxazolidinyl Methylphthalamide

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CAS No.

: NA

Mol F.

: C23H25FN4O5

Mol W.

: 456.47

Cat No.

: SA17533

Impurities, Linezolid

Linezolid impurity -F

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CAS No.

Mol F.

: C15H18FN3O5

Mol W.

: 339.32

Cat No.

: SA17525

Impurities, Linezolid

Linezolid Impurity A

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CAS No.

Mol F.

: C14H16FN5O3

Mol W.

: 321.31

Cat No.

: SA17527

Impurities, Linezolid

Linezolid Impurity B

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CAS No.

Mol F.

: C16H20FN3O3S

Mol W.

: 353.41

Cat No.

: SA17528

Impurities, Linezolid

Linezolid Impurity D

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CAS No.

Mol F.

: C15H19FN2O6S

Mol W.

: 374.38

Cat No.

: SA17529

Impurities, Linezolid

Linezolid Impurity G

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CAS No.

: 1391068-25-9; 333753-69-8(free base)

Mol F.

: C15H23ClFN3O3

Mol W.

: 347.81

Cat No.

: SA17526

Impurities, Linezolid

Linezolid Impurity H

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CAS No.

Mol F.

: C15H22FN3O3

Mol W.

: 311.35

Cat No.

: SA17530

Impurities, Lisinopril

Lisinopril

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CAS No.

: 83915-83-7(dihydrate);76547-98-3(anhydrous)

Mol F.

: C21H31N3O5

Mol W.

: 405.49

Cat No.

: SA35700

Impurities, Lisinopril

Lisinopril (R,S,S)-Isomer

$495.00 25 mg

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CAS No.

: 85955-59-5;1356019-70-9(sodiumsalt)

Mol F.

: C21H31N3O5

Mol W.

: 405.49

Cat No.

: SA35705

Impurities, Lisinopril

Lisinopril Des-Proline Impurity

$355.00 25 mg

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CAS No.

: 138247-43-5

Mol F.

: C16H24N2O4

Mol W.

: 308.37

Cat No.

: SA35708

Impurities, Lisinopril

Lisinopril Dimer

$1,550.00 25 mg

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CAS No.

: 1356839-89-8

Mol F.

: C42H60N6O9

Mol W.

: 792.96

Cat No.

: SA35707