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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, Loratadine

Loratadine 4-Nitrile

$255.00 25 mg

In Stock

CAS No.

: 860010-33-9

Mol F.

: C23H22ClN3O2

Mol W.

: 407.89

Cat No.

: SA34030

Impurities, Loratadine

Loratadine 8-Bromo Impurity

$395.00 25 mg

In Stock

CAS No.

: 130642-60-3

Mol F.

: C22H23BrN2O2

Mol W.

: 427.33

Cat No.

: SA34018

Impurities, Loratadine

Loratadine Cyano Impurity

$95.00 25 mg

In Stock

CAS No.

: 31255-57-9

Mol F.

: C14H11ClN2

Mol W.

: 242.7

Cat No.

: SA34021

Impurities, Loratadine

Loratadine Deschloro Impurity

$185.00 25 mg

In Stock

CAS No.

: 79779-58-1

Mol F.

: C22H24N2O2

Mol W.

: 348.44

Cat No.

: SA34022

Impurities, Loratadine

Loratadine EP Impurity A

$95.00 25 mg

In Stock

CAS No.

: 133284-74-9

Mol F.

: C22H25ClN2O3

Mol W.

: 400.9

Cat No.

: SA34001

Impurities, Loratadine

Loratadine EP Impurity F

$185.00 25 mg

In Stock

CAS No.

: 125743-80-8

Mol F.

: C22H24ClFN2O2

Mol W.

: 402.89

Cat No.

: SA34006

Impurities, Loratadine

Loratadine EP Impurity H

$95.00 25 mg

In Stock

CAS No.

: 29976-53-2

Mol F.

: C8H13NO3

Mol W.

: 171.19

Cat No.

: SA34008

Impurities, Loratadine

Loratadine N-Formyl Impurity

$155.00 25 mg

In Stock

CAS No.

: 117810-61-4

Mol F.

: C20H19ClN2O

Mol W.

: 338.83

Cat No.

: SA34026

Impurities, Loratadine

Loratadine N-Oxide

$155.00 25 mg

In Stock

CAS No.

: 165739-62-8

Mol F.

: C22H23ClN2O3

Mol W.

: 398.88

Cat No.

: SA34013

Impurities, Lorcaserin

Lorcaserin EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 953789-37-2

Mol F.

: C11H15Cl2N

Mol W.

: 232.15

Cat No.

: SA18804

Impurities, Losartan

Losartan Azide impurity

$155.00 25 mg

In Stock

CAS No.

: 727718-93-6

Mol F.

: C22H22ClN9

Mol W.

: 447.9

Cat No.

: SA26731

Impurities, Losartan

Losartan EP Impurity A

$95.00 25 mg

In Stock

CAS No.

: 79047-41-9

Mol F.

: C8H13ClN2O

Mol W.

: 188.65

Cat No.

: SA26701

Impurities, Losartan

Losartan EP Impurity B

$125.00 25 mg

In Stock

CAS No.

: 160514-13-6

Mol F.

: C14H12N4O

Mol W.

: 252.27

Cat No.

: SA26702

Impurities, Losartan

Losartan EP Impurity C

$295.00 25 mg

In Stock

CAS No.

: 114799-13-2(freeform);860644-28-6(potassiumsalt)

Mol F.

: C22H23ClN6O

Mol W.

: 422.91

Cat No.

: SA26703

Impurities, Losartan

Losartan EP Impurity F

$395.00 25 mg

In Stock

CAS No.

: 1332713-64-0

Mol F.

: C25H29ClN6O

Mol W.

: 464.99

Cat No.

: SA26706

Impurities, Losartan

Losartan EP Impurity J

$155.00 25 mg

In Stock

CAS No.

: 1006062-27-6

Mol F.

: C24H25ClN6O2

Mol W.

: 464.95

Cat No.

: SA26710

Impurities, Losartan

Losartan EP Impurity K

$185.00 25 mg

In Stock

CAS No.

: 114798-36-6

Mol F.

: C22H21ClN6O

Mol W.

: 420.89

Cat No.

: SA26711

Impurities, Losartan

Losartan EP Impurity L

$455.00 25 mg

In Stock

CAS No.

: 230971-71-8

Mol F.

: C44H44Cl2N12O

Mol W.

: 827.81

Cat No.

: SA26712

Impurities, Losartan

Losartan EP Impurity M

$455.00 25 mg

In Stock

CAS No.

: 230971-72-9

Mol F.

: C44H44Cl2N12O

Mol W.

: 827.81

Cat No.

: SA26713

Impurities, Loteprednol

Loteprednol

Please enquire for price & pack size

In Stock

CAS No.

: 129260-79-3

Mol F.

: C21H27ClO5

Mol W.

: 394.89

Cat No.

: SA27606

Impurities, Loteprednol

Loteprednol Dimer

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C47H60O14

Mol W.

: 848.97

Cat No.

: SA27611

Impurities, Loteprednol

Loteprednol etabonate methyl ester

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C24H32O7

Mol W.

: 432.51

Cat No.

: SA27603

Ezetimibe, Impurities

M-Fluoro oxazolidone

$70.00 25 mg

In Stock

CAS No.

: 189028-93-1

Mol F.

: C20H18FNO4

Mol W.

: 355.36

Cat No.

: SA14831

Impurities, Timolol

Maleic acid

Please enquire for price & pack size

In Stock

CAS No.

: 110-16-7

Mol F.

: C4H4O4

Mol W.

: 116.07

Cat No.

: SA23224

Fluorometholone, Impurities

Medratriene Bromohydrin

Please enquire for price & pack size

In Stock

CAS No.

: 110664-58-9

Mol F.

: C22H29BrO4

Mol W.

: 437.37

Cat No.

: SA38414

Impurities, Memantine

Memantine Lactose Adduct

Please enquire for price & pack size

In Stock

CAS No.

: 1159637-28-1

Mol F.

: C24H41NO10

Mol W.

: 503.58

Cat No.

: SA29300

Impurities, Mesalamine

Mesalamine impurity I

Please enquire for price & pack size

In Stock

CAS No.

: 3147-53-3

Mol F.

: C₁₃H₁₀N₂O₃

Mol W.

: 242.23

Cat No.

: SA21308

Impurities, Mesalamine

Mesalamine impurity P

Please enquire for price & pack size

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

Please enquire for price & pack size

In Stock

CAS No.

: 461-58-5

Mol F.

: C2H4N4

Mol W.

: 84.08

Cat No.

: SA27500

Impurities, Metformin

Metformin EP Impurity C

Please enquire for price & pack size

In Stock

CAS No.

: 1985-46-2

Mol F.

: C5H10N6

Mol W.

: 154.17

Cat No.

: SA27502

Impurities, Metformin

Metformin EP Impurity D

Please enquire for price & pack size

In Stock

CAS No.

: 108-78-1

Mol F.

: C3H6N6

Mol W.

: 126.12

Cat No.

: SA27503

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

Please enquire for price & pack size

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

Please enquire for price & pack size

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

Please enquire for price & pack size

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

Please enquire for price & pack size

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

Please enquire for price & pack size

In Stock

CAS No.

: 1926-80-3

Mol F.

: C7H16ClNO2

Mol W.

: 181.66

Cat No.

: SA22612

Etoricoxib, Impurities

Methyl 6-Methylnicotinate

Please enquire for price & pack size

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

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