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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, Memantine

Memantine Lactose Adduct

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In Stock

CAS No.

: 1159637-28-1

Mol F.

: C24H41NO10

Mol W.

: 503.58

Cat No.

: SA29300

Impurities, Mesalamine

Mesalamine impurity I

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In Stock

CAS No.

: 3147-53-3

Mol F.

: C₁₃H₁₀N₂O₃

Mol W.

: 242.23

Cat No.

: SA21308

Impurities, Mesalamine

Mesalamine impurity P

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In Stock

CAS No.

: 887256-40-8

Mol F.

: C₁₃H₁₁NO₆S

Mol W.

: 309.29

Cat No.

: SA21315

Impurities, Mesalamine

Mesalamine impurity S

$500.00 25 mg

In Stock

CAS No.

: 1797983-23-3

Mol F.

: C₁₄H₁₂N₂O₅

Mol W.

: 288.26

Cat No.

: SA21318

Impurities, Metformin

Metformin EP Impurity A

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In Stock

CAS No.

: 461-58-5

Mol F.

: C2H4N4

Mol W.

: 84.08

Cat No.

: SA27500

Impurities, Metformin

Metformin EP Impurity C

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In Stock

CAS No.

: 1985-46-2

Mol F.

: C5H10N6

Mol W.

: 154.17

Cat No.

: SA27502

Impurities, Metformin

Metformin EP Impurity D

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In Stock

CAS No.

: 108-78-1

Mol F.

: C3H6N6

Mol W.

: 126.12

Cat No.

: SA27503

Impurities, Metformin

Metformin EP Impurity E

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In Stock

CAS No.

: 1674-62-0 (HCl salt); 1609-00-3 (base)

Mol F.

: C3H9N5

Mol W.

: 115.14

Cat No.

: SA27504

Impurities, Sofosbuvir

Methoxy Sofosbuvir Impurity

$395.00 5 mg

In Stock

CAS No.

: 1394157-34-6

Mol F.

: C20H25FN3O9P

Mol W.

: 501.4

Cat No.

: SA15443

Cefprozil, Impurities

Methoxycefadroxil

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In Stock

CAS No.

: NA

Mol F.

: C17H19N3O6S

Mol W.

: 393.42

Cat No.

: SA31916

Impurities, Rosuvastatin

Methyl (3R)-3-(tert-Butyldimethylsilanyloxy)-5-oxo-6-(triphenylphosphanylidene)hexanoate

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In Stock

CAS No.

: 147118-35-2

Mol F.

: C31H39O4PSi

Mol W.

: 534.7

Cat No.

: SA12188

Impurities, Ticagrelor

Methyl 2-((3aR,4S,6R,6aS)-6- amino-2,2-dimethyltetrahydro- 3aH-cyclopenta[d][1,3]dioxol- 4-yloxy)acetate

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In Stock

CAS No.

Mol F.

: C11H19NO5

Mol W.

: 245.27

Cat No.

: SA32520

Febuxostat, Impurities

Methyl 2-[3-Cyano-4-(2-methylpropoxy)phenyl]-4-methylthiazole-5-carboxylate

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In Stock

CAS No.

: 923942-34-1

Mol F.

: C₁₇H₁₈N₂O₃S

Mol W.

: 330.4

Cat No.

: SA32004

Impurities, Nintedanib

Methyl 2-oxoindole-6-carboxylate

$95.00 25 mg

In Stock

CAS No.

: 14192-26-8

Mol F.

: C10H9NO3

Mol W.

: 191.18

Cat No.

: SA22515

Impurities, Sitagliptin

Methyl 3-Oxo-4-(2,4,5-trifluorophenyl)butanoate

$95.00 25 mg

In Stock

CAS No.

: 769195-26-8

Mol F.

: C11H9F3O3

Mol W.

: 246.18

Cat No.

: SA10438

Aminocaproic Acid, Impurities

Methyl 6-aminohexanoate hydrochloride

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In Stock

CAS No.

: 1926-80-3

Mol F.

: C7H16ClNO2

Mol W.

: 181.66

Cat No.

: SA22612

Etoricoxib, Impurities

Methyl 6-Methylnicotinate

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In Stock

CAS No.

: 5470-70-2

Mol F.

: C8H9NO2

Mol W.

: 151.16

Cat No.

: SA41605

Impurities, Ipratropium Bromide

Methylatropine Bromide

$170.00 25 mg

In Stock

CAS No.

: 2870-71-5

Mol F.

: C18H26BrNO3

Mol W.

: 384.31

Cat No.

: SA36007

Carbidopa, Impurities

Methyldopa EP Impurity C | CAS : 5486-79-3

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In Stock

CAS No.

: 5486-79-3

Mol F.

: C12H17NO4

Mol W.

: 239.3

Cat No.

: SA31816

Impurities, Methylprednisolone

Methylprednisolone 17-Propionate (Impurity C)

$125.00 25 mg

In Stock

CAS No.

: 79512-61-1

Mol F.

: C25H34O6

Mol W.

: 430.53

Cat No.

: SA14424

Impurities, Methylprednisolone

Methylprednisolone 21-Propionate

$95.00 25 mg

In Stock

CAS No.

: 138804-88-3

Mol F.

: C25H34O6

Mol W.

: 430.53

Cat No.

: SA14413

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity A

$255.00 25 mg

In Stock

CAS No.

: 93963-74-7

Mol F.

: C24H34O6

Mol W.

: 418.52

Cat No.

: SA25004

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity C

$125.00 25 mg

In Stock

CAS No.

: 58636-50-3

Mol F.

: C22H28O5

Mol W.

: 372.45

Cat No.

: SA25000

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity E

$75.00 25 mg

In Stock

CAS No.

: 52-21-1

Mol F.

: C23H30O6

Mol W.

: 402.48

Cat No.

: SA25005

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity F

$155.00 25 mg

In Stock

CAS No.

Mol F.

: C24H30O5

Mol W.

: 398.49

Cat No.

: SA25002

Impurities, Methylprednisolone Acetate

Methylprednisolone Acetate EP Impurity K

$155.00 25 mg

In Stock

CAS No.

: 115321-98-7

Mol F.

: C24H30O6

Mol W.

: 414.49

Cat No.

: SA25011

Impurities, Methylprednisolone

Methylprednisolone Dimer

$495.00 25 mg

In Stock

CAS No.

Mol F.

: C44H58O9

Mol W.

: 730.93

Cat No.

: SA14414

Impurities, Methylprednisolone

Methylprednisolone EP Impurity A

$125.00 25 mg

In Stock

CAS No.

: 91523-05-6

Mol F.

: C22H28O5

Mol W.

: 372.45

Cat No.

: SA14402

Impurities, Methylprednisolone

Methylprednisolone EP Impurity C

$175.00 25 mg

In Stock

CAS No.

: 61919-52-6

Mol F.

: C20H26O3

Mol W.

: 314.42

Cat No.

: SA14403

Impurities, Methylprednisolone

Methylprednisolone EP Impurity D

$125.00 25 mg

In Stock

CAS No.

: 1338549-02-2

Mol F.

: C22H28O4

Mol W.

: 356.46

Cat No.

: SA14404

Impurities, Methylprednisolone

Methylprednisolone EP Impurity E

$255.00 25 mg

In Stock

CAS No.

: 229019-44-7

Mol F.

: C21H28O4

Mol W.

: 344.44

Cat No.

: SA14406

Impurities, Methylprednisolone

Methylprednisolone EP Impurity G

$125.00 25 mg

In Stock

CAS No.

: 93269-35-3

Mol F.

: C22H28O4

Mol W.

: 356.46

Cat No.

: SA14408

Impurities, Methylprednisolone

Methylprednisolone EP Impurity J

$95.00 25 mg

In Stock

CAS No.

: 53-36-1

Mol F.

: C24H32O6

Mol W.

: 416.51

Cat No.

: SA14410

Impurities, Methylprednisolone

Methylprednisolone EP Impurity L

$355.00 25 mg

In Stock

CAS No.

: 6870-94-6

Mol F.

: C22H30O4

Mol W.

: 358.47

Cat No.

: SA14412

Impurities, Methylprednisolone

Methylprednisolone-17-propionate-11, 21 diacetate (Impurity E)

$125.00 25 mg

In Stock

CAS No.

Mol F.

: C29H38O8

Mol W.

: 514.6

Cat No.

: SA14423

Impurities, Mexiletine

Mexiletine Intermediate

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In Stock

CAS No.

Mol F.

: C16H18O2

Mol W.

: 242.31

Cat No.

: SA50201

Impurities, Miconazole

Miconazole

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In Stock

CAS No.

: 22916-47-8

Mol F.

: C18H14Cl4N2O

Mol W.

: 416.13

Cat No.

: SA51500

Impurities, Miconazole

Miconazole EP Impurity B; Econazole

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In Stock

CAS No.

: 27220-47-9

Mol F.

: C18H15Cl3N2O

Mol W.

: 381.68

Cat No.

: SA51506

Impurities, Miconazole

Miconazole EP Impurity F

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In Stock

CAS No.

: 47447-55-2

Mol F.

: C18H14Cl4N2O

Mol W.

: 416.13

Cat No.

: SA51501

Impurities, Miconazole

Miconazole EP Impurity G; Miconazole 2,5-Isomer

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In Stock

CAS No.

: 909277-71-0

Mol F.

: C18H14Cl4N2O

Mol W.

: 416.13

Cat No.

: SA51504

Impurities, Miconazole

Miconazole EP Impurity H

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In Stock

CAS No.

: 181931-30-6

Mol F.

: C18H16Cl2N2O

Mol W.

: 347.24

Cat No.

: SA51507

Impurities, Miconazole

Miconazole Impurity H nitarte salt

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In Stock

CAS No.

: 203264-09-9

Mol F.

: C18H17Cl2N3O4

Mol W.

: 410.25

Cat No.

: SA51502

Impurities, Miconazole

Miconazole Related Compound A; Econazole EP Impurity A

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In Stock

CAS No.

: 24155-42-8

Mol F.

: C11H10Cl2N2O

Mol W.

: 257.11

Cat No.

: SA51503

Impurities, Miconazole

Miconazole Related Compound I

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In Stock

CAS No.

: 47363-37-1

Mol F.

: C18H15Cl3N2O

Mol W.

: 381.7

Cat No.

: SA51508

Impurities, Midazolam

Midazolam EP Impurity G

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In Stock

CAS No.

: 59467-86-6

Mol F.

: C18H14ClN3

Mol W.

: 307.77

Cat No.

: SA44306

Impurities, Midazolam

Midazolam Impurity E

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In Stock

CAS No.

: 59467-64-0

Mol F.

: C16H15ClFN3

Mol W.

: 303.76

Cat No.

: SA44303

Impurities, Midazolam

Midazolam Nitromethylene Compound

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In Stock

CAS No.

: 60656-76-0

Mol F.

: C16H11ClFN3O3

Mol W.

: 347.73

Cat No.

: SA44305

Impurities, Milnacipran

Milnacipran EP Impurity B

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In Stock

CAS No.

: 85-41-6

Mol F.

: C₈H₅NO₂

Mol W.

: 147.13

Cat No.

: SA24301

Impurities, Milnacipran

Milnacipran EP Impurity C

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In Stock

CAS No.

: 70209-83-5

Mol F.

: C11H12O3

Mol W.

: 192.21

Cat No.

: SA24302

Impurities, Milnacipran

Milnacipran EP Impurity G

Please enquire for price & pack size

In Stock

CAS No.

: 1353644-49-1

Mol F.

: C15H21NO2

Mol W.

: 247.33

Cat No.

: SA24306