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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, Leflunomide

Leflunomide EP Impurity D

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Out of Stock

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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Out of Stock

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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Out of Stock

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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Out of Stock

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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Out of Stock

CAS No.

: 24522-30-3

Mol F.

: C10H7F3N2O

Mol W.

: 228.17

Cat No.

: SA21808

Impurities, Lenalidomide

Lenalidomide

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Out of Stock

CAS No.

: 191732-72-6

Mol F.

: C13H13N3O3

Mol W.

: 259.26

Cat No.

: SA34100

Impurities, Lercanidipine

Lercanidipine Dimer Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

Mol F.

: C55H64N4O6

Mol W.

: 877.12

Cat No.

: SA50908

Impurities, Lercanidipine

Lercanidipine EP Impurity D

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Out of Stock

CAS No.

: 210579-71-8

Mol F.

: C37H43N3O6.HCl

Mol W.

: 662.21

Cat No.

: SA50906

Impurities, Lercanidipine

Lercanidipine Hydrochloride

Please enquire for price & pack size

Out of Stock

CAS No.

: 132866-11-6

Mol F.

: C36H42ClN3O6

Mol W.

: 648.19

Cat No.

: SA50900

Impurities, Lercanidipine

Lercanidipine Impurity A

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Out of Stock

CAS No.

: 74936-74-6

Mol F.

: C19H22N2O6

Mol W.

: 374.39

Cat No.

: SA50901

Impurities, Lercanidipine

Lercanidipine Impurity C

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Out of Stock

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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Out of Stock

CAS No.

: 7682-20-4

Mol F.

: C4H11ClN2O

Mol W.

: 138.6

Cat No.

: SA46000

Carbidopa, Impurities

Levodopa EP Impurity-D

Please enquire for price & pack size

Out of Stock

CAS No.

: 5796-17-8

Mol F.

: C9H11NO4

Mol W.

: 197.19

Cat No.

: SA31812

Impurities, Levofloxacin

Levofloxacin

Please enquire for price & pack size

Out of Stock

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

Please enquire for price & pack size

Out of Stock

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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Out of Stock

CAS No.

: NA

Mol F.

: C18H21N3O4

Mol W.

: 343.38

Cat No.

: SA18410

Impurities, Levofloxacin

Levofloxacin EP Impurity A

Please enquire for price & pack size

Out of Stock

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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Out of Stock

CAS No.

: 117678-37-2

Mol F.

: C18H20FN3O5

Mol W.

: 377.37

Cat No.

: SA18408

Impurities, Levofloxacin

Levofloxacin EP Impurity D

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Out of Stock

CAS No.

: 117620-85-6(base)

Mol F.

: C18H22ClN3O4 (HCl)

Mol W.

: 379.84

Cat No.

: SA18409

Impurities, Levofloxacin

Levofloxacin EP Impurity E

Please enquire for price & pack size

Out of Stock

CAS No.

: 178964-53-9

Mol F.

: C17H20FN3O2

Mol W.

: 317.36

Cat No.

: SA18403

Impurities, Levofloxacin

Levofloxacin EP Impurity G

Please enquire for price & pack size

Out of Stock

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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Out of Stock

CAS No.

: 177472-30-9

Mol F.

: C20H24FN3O4

Mol W.

: 389.42

Cat No.

: SA18404

Impurities, Levofloxacin

Levofloxacin EP Impurity I

Please enquire for price & pack size

Out of Stock

CAS No.

: 178912-62-4(base)

Mol F.

: C18H21ClFN3O4 (HCl)

Mol W.

: 397.83

Cat No.

: SA18405

Impurities, Levomilnacipran

Levomilnacipran

Please enquire for price & pack size

Out of Stock

CAS No.

: 96847-55-1

Mol F.

: C11H13NO2

Mol W.

: 191.23

Cat No.

: SA29200

Impurities, Levonorgestrel

Levonorgestrel

Please enquire for price & pack size

Out of Stock

CAS No.

: 797-63-7

Mol F.

: C₂₁H₂₈O₂

Mol W.

: 312.45

Cat No.

: SA23703

Impurities, Levonorgestrel

Levonorgestrel 3-Ethyldienol Ether

Please enquire for price & pack size

Out of Stock

CAS No.

: 24908-87-0

Mol F.

: C23H32O2

Mol W.

: 340.5

Cat No.

: SA23700

Impurities, Levonorgestrel

Levonorgestrel 5α-Dihydro Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 78088-19-4

Mol F.

: C21H30O2

Mol W.

: 314.45999999999998

Cat No.

: SA23701

Impurities, Levonorgestrel

Levonorgestrel 6-Hydroxy Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 40915-05-7

Mol F.

: C21H28O3

Mol W.

: 328.45

Cat No.

: SA23702

Impurities, Levonorgestrel

Levonorgestrel Acetate

Please enquire for price & pack size

Out of Stock

CAS No.

: 13732-69-9

Mol F.

: C₂₃H₃₀O₃

Mol W.

: 354.48

Cat No.

: SA23704

Impurities, Levonorgestrel

Levonorgestrel Acetate Delta-5 Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 1175110-92-5

Mol F.

: C23H30O3

Mol W.

: 354.48

Cat No.

: SA23705

Impurities, Levonorgestrel

Levonorgestrel EP Impurity A

Please enquire for price & pack size

Out of Stock

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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Out of Stock

CAS No.

: 32419-58-2

Mol F.

: C₂₁H₃₀O

Mol W.

: 298.45999999999998

Cat No.

: SA23709

Impurities, Levonorgestrel

Levonorgestrel EP Impurity N

Please enquire for price & pack size

Out of Stock

CAS No.

: 4222-96-2

Mol F.

: C₁₉H₂₆O₂

Mol W.

: 286.41000000000003

Cat No.

: SA23716

Impurities, Levonorgestrel

Levonorgestrel EP Impurity O

Please enquire for price & pack size

Out of Stock

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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Out of Stock

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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Out of Stock

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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Out of Stock

CAS No.

: 2322-77-2

Mol F.

: C₂₀H₂₈O₂

Mol W.

: 300.44

Cat No.

: SA23720

Impurities, Levonorgestrel

Levonorgestrel EP Impurity S

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Out of Stock

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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Out of Stock

CAS No.

: 799-43-9

Mol F.

: C22H30O2

Mol W.

: 326.47000000000003

Cat No.

: SA23722

Impurities, Sulpiride

Levosulpiride

Please enquire for price & pack size

Out of Stock

CAS No.

: 23672-07-3

Mol F.

: C15H23N3O4S

Mol W.

: 341.43

Cat No.

: SA10908

Impurities, Sulpiride

Levosulpiride EP impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 22795-99-9

Mol F.

: C7H16N2

Mol W.

: 128.22

Cat No.

: SA10911

Impurities, Levothyroxine

Levothyroxine Acetamide Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 176258-88-1

Mol F.

: C14H9I4NO3

Mol W.

: 746.84

Cat No.

: SA24701

Impurities, Levothyroxine

Levothyroxine beta-Hydroxy Impurity

Please enquire for price & pack size

Out of Stock

CAS No.

: 107849-54-7

Mol F.

: C15H11I4NO5

Mol W.

: 792.87

Cat No.

: SA24702

Impurities, Levothyroxine

Levothyroxine D-Isomer

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Out of Stock

CAS No.

: 51-49-0

Mol F.

: C15H11I4NO4

Mol W.

: 776.87

Cat No.

: SA24703

Impurities, Levothyroxine

Levothyroxine EP Impurity A

Please enquire for price & pack size

Out of Stock

CAS No.

: 6893-02-3

Mol F.

: C15H12I3NO4

Mol W.

: 650.97

Cat No.

: SA24704

Impurities, Levothyroxine

Levothyroxine EP Impurity B

Please enquire for price & pack size

Out of Stock

CAS No.

: 1628720-66-0

Mol F.

: C15H11ClI3NO4

Mol W.

: 685.42

Cat No.

: SA24705

Impurities, Levothyroxine

Levothyroxine EP Impurity C

Please enquire for price & pack size

Out of Stock

CAS No.

: 51-24-1

Mol F.

: C14H9I3O4

Mol W.

: 621.92999999999995

Cat No.

: SA24706

Impurities, Levothyroxine

Levothyroxine EP Impurity D

Please enquire for price & pack size

Out of Stock

CAS No.

: 67-30-1

Mol F.

: C14H8I4O4

Mol W.

: 747.83

Cat No.

: SA24707

Impurities, Levothyroxine

Levothyroxine EP Impurity E

Please enquire for price & pack size

Out of Stock

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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Out of Stock

CAS No.

: 911661-90-0

Mol F.

: C21H13I6NO5

Mol W.

: 1120.76

Cat No.

: SA24709