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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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Dapagliflozin, Impurities

1α-Methoxy Dapagliflozin C-2 Epimer

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In Stock

CAS No.

Mol F.

: C22H27ClO7

Mol W.

: 438.9

Cat No.

: SA15025

Bromfenac, Impurities

2- Bromo bromfenac isomer

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In Stock

CAS No.

: 748735-66-2 (Free acid)

Mol F.

: C15H11BrNNaO3

Mol W.

: 356.15

Cat No.

: SA18914

Impurities, Lisinopril

2-((3aR,4S,6R,6aS)-6-amino-2,2- dimethyltetrahydro-3aHcyclopenta[ d][1,3]dioxol-4- yloxy)ethanol

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In Stock

CAS No.

: NA

Mol F.

: C10H19NO4

Mol W.

: 217.26

Cat No.

: SA32522

Impurities, Isavuconazole

2-((R)-1-(2-(2,5-difluorophenyl)oxiran-2-yl)ethoxy)tetrahydro-2H-pyran

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In Stock

CAS No.

: 241479-70-9

Mol F.

: C15H18F2O3

Mol W.

: 284.3

Cat No.

: SA44129

Impurities, Isavuconazole

2-((S)-1-((S)-2-(2,5-difluorophenyl)oxiran-2-yl)ethoxy)tetrahydro-2H-pyran

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In Stock

CAS No.

Mol F.

: C15H18F2O3

Mol W.

: 284.3

Cat No.

: SA44133

Impurities, Manidipine

2-(4-Diphenylmethyl-1-piperazinyl)ethyl Acetoacetate

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In Stock

CAS No.

: 89226-49-3

Mol F.

: C23H28N2O3

Mol W.

: 380.48

Cat No.

: SA29805

Canagliflozin, Impurities

2-(4-fluorophenyl)-5-(2-Methylbenzyl)thiophene

$90.00 25 mg

In Stock

CAS No.

: 2005454-69-1

Mol F.

: C18H15FS

Mol W.

: 282.4

Cat No.

: SA14923

Etoricoxib, Impurities

2-(4-Methanesulfonyl-phenyl)-1-(6-methyl-pyridin-3-yl)-ethanone

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In Stock

CAS No.

: 221615-75-4

Mol F.

: C15H15NO3S

Mol W.

: 289.35

Cat No.

: SA41606

Impurities, Ticagrelor

2-(Propylthio)pyrimidine-4,6-diol

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In Stock

CAS No.

: 145783-12-6

Mol F.

: C7H10N2O2S

Mol W.

: 186.23

Cat No.

: SA32514

Impurities, Rivaroxaban

2-[(2S)-2-Hydroxy-3-[[4-(3-oxo-4-morpholinyl)phenyl]amino]propyl]-1H-isoindole-1,3(2H)-dione

$100.00 25 mg

In Stock

CAS No.

: 1369969-44-7

Mol F.

: C21H21N3O5

Mol W.

: 395.42

Cat No.

: SA18626

Impurities, Montelukast Sodium

2-[3-(R)-[3-(2-(7-Chloro-2-quinolinyl)ethenyl)phenyl]-3-hydroxypropyl]phenyl-2-propanol

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In Stock

CAS No.

: 150026-75-8

Mol F.

: C29H28ClNO2

Mol W.

: 457.99

Cat No.

: SA44901

Impurities, Pitavastatin

2-Amino-2′-fluorobenzophenone

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In Stock

CAS No.

: 1581-13-1

Mol F.

: C13H10FNO

Mol W.

: 215.22

Cat No.

: SA29522

Bromfenac, Impurities

2-Amino-3-(4-bromobenzoyl)-α-oxobenzeneacetic Acid Sodium

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In Stock

CAS No.

: 1391052-54-2

Mol F.

: C15H9BrNNaO4

Mol W.

: 370.13

Cat No.

: SA18907

Edoxaban, Impurities

2-Amino-5-chloropyridine

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In Stock

CAS No.

: 1072-98-6

Mol F.

: C5H5ClN2

Mol W.

: 128.56

Cat No.

: SA33035

Bupropion, Impurities

2-Bromo-1-(3,4-dichlorophenyl)propan-1-one

$110.00 25 mg

In Stock

CAS No.

: 87427-61-0

Mol F.

: C₉H₇BrCl₂O

Mol W.

: 281.96

Cat No.

: SA12222

Atorvastatin, Impurities

2-Bromo-2-phenyl-1-(4-fluorophenyl)-ethanone

$100.00 25 mg

In Stock

CAS No.

: 88675-31-4

Mol F.

: C14H10BrFO

Mol W.

: 293.13

Cat No.

: SA17808

Bupropion, Impurities

2-Bromo-2’-chloropropiophenone

$125.00 25 mg

In Stock

CAS No.

: 75815-22-4

Mol F.

: C₉H₈BrClO

Mol W.

: 247.52

Cat No.

: SA12228

Brimonidine, Impurities

2-Bromo-6-nitroaniline

$80.00 25 mg

In Stock

CAS No.

: 59255-95-7

Mol F.

: C6H5BrN2O2

Mol W.

: 217.02

Cat No.

: SA20719

Chlorpromazine, Impurities

2-Bromophenothiazine

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In Stock

CAS No.

: 66820-95-9

Mol F.

: C12H8BrNS

Mol W.

: 278.17

Cat No.

: SA21618

Chlorpromazine, Impurities

2-Chloro-10-(3-chloropropyl)phenothiazine

$95.00 25 mg

In Stock

CAS No.

: 2765-59-5

Mol F.

: C15H13Cl2NS

Mol W.

: 310.24

Cat No.

: SA21603

Etoricoxib, Impurities

2-Chloro-3-(dimethylamino)-N,N-dimethyl-2-propen-1-aminium Hexafluorophosphate

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In Stock

CAS No.

: 291756-76-8

Mol F.

: C7H14ClN2F6P

Mol W.

: 306.62

Cat No.

: SA41607

Impurities, Nintedanib

2-Chloro-N-methyl-N-(4-nitrophenyl)acetamide

$85.00 50 mg

In Stock

CAS No.

: 2653-16-9

Mol F.

: C9H9ClN2O3

Mol W.

: 228.63

Cat No.

: SA22514

Impurities, Omeprazole

2-Chloromethyl-3,5-dimethylpyridin-4-ol

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In Stock

CAS No.

: 220771-03-9

Mol F.

: C8HClNO

Mol W.

: 171.62

Cat No.

: SA19406

Chlorpromazine, Impurities

2-Chlorophenothiazine sulfoxide

$125.00 25 mg

In Stock

CAS No.

: 1927-43-1

Mol F.

: C12H8ClNOS

Mol W.

: 249.72

Cat No.

: SA21600

Impurities, Neomycin

2-Deoxystreptamine dihydrochloride

Please enquire for price & pack size

In Stock

CAS No.

: 14429-30-2

Mol F.

: C6H16Cl2N2O3

Mol W.

: 235.11

Cat No.

: SA51401

Impurities, Sitagliptin

2-desfluoro 3-oxobutanoate methyl ester Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 1032506-99-2

Mol F.

: C11H10F2O3

Mol W.

: 228.19

Cat No.

: SA10443

Efinaconazole, Impurities

2-desfluoro Efinaconazole

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In Stock

CAS No.

: NA

Mol F.

: C18H23FN4O

Mol W.

: 330.4

Cat No.

: SA23609

Impurities, Sitagliptin

2-desfluoro N-Boc methyl ester Impurity

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In Stock

CAS No.

Mol F.

: C16H21F2NO4

Mol W.

: 329.34

Cat No.

: SA10444

Impurities, Sitagliptin

2-Desfluoro Sitagliptin

$295.00 25 mg

In Stock

CAS No.

: 486459-88-5

Mol F.

: C16H16F5N5O

Mol W.

: 389.32

Cat No.

: SA10410

Atorvastatin, Impurities

2-Fluoro Atorvastatin

$500.00 100 mg

In Stock

CAS No.

: 1346598-86-4; 1346746-49-3 (Free acid)

Mol F.

: C33H34FN2NaO5

Mol W.

: 580.62

Cat No.

: SA17801

Impurities, Irganox

2-Heptenoic Acid Butyl Ester

Please enquire for price & pack size

In Stock

CAS No.

: 52392-62-8

Mol F.

: C11H20O2

Mol W.

: 184.28

Cat No.

: SA11107

Cangrelor, Impurities

2-Mercapto Adenosine

$115.00 25 mg

In Stock

CAS No.

: 43157-50-2

Mol F.

: C₁₀H₁₃N₅O₄S

Mol W.

: 299.31

Cat No.

: SA29401

Clotrimazole, Impurities

2-methyl-1H-imidazole Clotrimazole

Please enquire for price & pack size

In Stock

CAS No.

: 98751-53-2

Mol F.

: C23H19ClN2

Mol W.

: 358.86

Cat No.

: SA11611

Impurities, Sofosbuvir

2-R-Methyl Sofosbuvir

$595.00 25 mg

In Stock

CAS No.

: 1496552-28-3

Mol F.

: C22H29FN3O9P

Mol W.

: 529.46

Cat No.

: SA15403

Impurities, Ticagrelor

2-Thiobarbituric Acid

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In Stock

CAS No.

: 504-17-6

Mol F.

: C4H4N2O2S

Mol W.

: 144.15

Cat No.

: SA32513

Erlotinib, Impurities

2,2′-(1-chlorophthalazine-6,7-diyl)bis(oxy)diethanol

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C12H13ClN2O4

Mol W.

: 284.7

Cat No.

: SA25228

Impurities, Naloxone

2,2′-Bisnaloxone

Please enquire for price & pack size

In Stock

CAS No.

: 211738-08-8

Mol F.

: C38H40N2O8

Mol W.

: 652.73

Cat No.

: SA45112

Carbamazepine, Impurities

2,2’-Dinitrodibenzyl

Please enquire for price & pack size

In Stock

CAS No.

: 16968-19-7

Mol F.

: C14H12N2O4

Mol W.

: 272.26

Cat No.

: SA20303

Carbamazepine, Impurities

2,2’-Ethylenedianiline

$95.00 25 mg

In Stock

CAS No.

: 34124-14-6

Mol F.

: C14H16N2

Mol W.

: 212.29

Cat No.

: SA20301

Atorvastatin, Impurities

2,3-Dehydroxy Atorvastatin (E/Z mixture); Atorvastatin EP Impurity J

$120.00 10 mg

In Stock

CAS No.

: 1105067-93-3

Mol F.

: C33H33FN2O4

Mol W.

: 579.69

Cat No.

: SA17818

Impurities, Lansoprazole

2,3-Dimethyl-4-(2,2,2-trifluoroethoxy)pyridine-N-oxide

Please enquire for price & pack size

In Stock

CAS No.

: 103577-61-3

Mol F.

: C9H10F3NO2

Mol W.

: 221.18

Cat No.

: SA35918

Impurities, Prazosin

2,4-Diamino-6,7-dimethoxyquinazoline

Please enquire for price & pack size

In Stock

CAS No.

: 60547-96-8

Mol F.

: C₁₀H₁₂N₄O₂

Mol W.

: 220.23

Cat No.

: SA24208

Impurities, Prazosin

2,4-Dichloro-6,7-dimethoxy-quinazoline

Please enquire for price & pack size

In Stock

CAS No.

: 27631-29-4

Mol F.

: C10H8Cl2N2O2

Mol W.

: 259.08999999999997

Cat No.

: SA24206

Amylmetacresol, Impurities

2,4-Dichlorobenzyl Alcohol CRS

Please enquire for price & pack size

In Stock

CAS No.

: 1777-82-8

Mol F.

: C7H6Cl2O

Mol W.

: 177.03

Cat No.

: SA46400

Efinaconazole, Impurities

2,4-didesfluoro Efinaconazole

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C18H24N4O

Mol W.

: 312.41000000000003

Cat No.

: SA23610

Celecoxib, Impurities

2,4-Dimethyl Celecoxib

$145.00 25 mg

In Stock

CAS No.

: 170570-09-9

Mol F.

: C18H16F3N3O2S

Mol W.

: 395.4

Cat No.

: SA11302

Dapagliflozin, Impurities

2,5-Dibromophenyl) (4-ethoxyphenyl) methanone

$215.00 25 mg

In Stock

CAS No.

: 1713015-63-4

Mol F.

: C15H12Br2O2

Mol W.

: 384.06

Cat No.

: SA15062

Impurities, Loratadine

2,8-Dichloro-5, 6 -dihydro-11Hbenzo[ 5,6] cyclohepta[1,2- b]pyridin-11-one

Please enquire for price & pack size

In Stock

CAS No.

: 133330-61-7

Mol F.

: C14H9Cl2NO

Mol W.

: 278.13

Cat No.

: SA34033

Impurities, Lamivudine

2’-Epi-Lamivudine; Lamivudine EP Impurity B

Please enquire for price & pack size

In Stock

CAS No.

: 136846-20-3

Mol F.

: C8H11N3O3S

Mol W.

: 229.26

Cat No.

: SA22306

Impurities, Sofosbuvir

2’S-α-Fluoro tribenzoyl sofosbuvir intermidiate

$1,995.00 25 mg

In Stock

CAS No.

Mol F.

: C31H26FN3O7

Mol W.

: 571.55

Cat No.

: SA15437