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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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2,4-Diamino-6,7-dimethoxyquinazoline | 60547-96-8 | 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

2,4-Dichloro-6,7-dimethoxy-quinazoline | 27631-29-4 | Prazosin

,

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

CAS No.

: 27631-29-4

Mol F.

: C10H8Cl2N2O2

Mol W.

: 259.09

Cat No.

: SA24206

2,4-Dichlorobenzyl Alcohol CRS | 1777-82-8 | Amylmetacresol

,

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

2,4-didesfluoro Efinaconazole | Efinaconazole

,

2,4-didesfluoro Efinaconazole
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In Stock

CAS No.

: NA

Mol F.

: C18H24N4O

Mol W.

: 312.41

Cat No.

: SA23610

2,5-Dibromophenyl) (4-ethoxyphenyl) methanone | 1713015-63-4 | Dapagliflozin

,

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

2,8-Dichloro-5, 6 -dihydro-11Hbenzo[ 5,6] cyclohepta[1,2- b]pyridin-11-one | 133330-61-7 | Loratadine

2,8-Dichloro-5, 6 -dihydro-11Hbenzo[ 5,6] cyclohepta[1,2- b]pyridin-11-one
$555.00 50 mg
In Stock

CAS No.

: 133330-61-7

Mol F.

: C14H9Cl2NO

Mol W.

: 278.13

Cat No.

: SA34033

2’-Epi-Lamivudine; Lamivudine EP Impurity B | 136846-20-3 | Lamivudine

,

2’-Epi-Lamivudine; Lamivudine EP Impurity B
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In Stock

CAS No.

: 136846-20-3

Mol F.

: C8H11N3O3S

Mol W.

: 229.26

Cat No.

: SA22306

2’S-α-Fluoro tribenzoyl sofosbuvir intermidiate | Sofosbuvir

2’S-α-Fluoro tribenzoyl sofosbuvir intermidiate
$555.00 5 mg
In Stock

CAS No.

Mol F.

: C31H26FN3O7

Mol W.

: 571.55

Cat No.

: SA15437

2(R)-Methyl Sofosbuvir; Sofosbuvir Impurity C | 1496552-28-3 | Sofosbuvir

2(R)-Methyl Sofosbuvir; Sofosbuvir Impurity C
$355.00 5 mg
In Stock

CAS No.

: 1496552-28-3

Mol F.

: C22H29FN3O9P

Mol W.

: 529.46

Cat No.

: SA15403

2′-Alkene Mono-N-Benzoyl Sofosbuvir | Sofosbuvir

2′-Alkene Mono-N-Benzoyl Sofosbuvir
$255.00 5 mg
In Stock

CAS No.

Mol F.

: C17H17N3O5

Mol W.

: 343.33

Cat No.

: SA15431

2′-Alkene Sofosbuvir; 2’-Defluro-2’-methylene Sofosbuvir | 2095551-20-3 | Sofosbuvir

2′-Alkene Sofosbuvir; 2’-Defluro-2’-methylene Sofosbuvir
$555.00 5 mg
In Stock

CAS No.

: 2095551-20-3

Mol F.

: C22H28N3O9P

Mol W.

: 509.46

Cat No.

: SA15411

2′-Hydroxy Sofosbuvir | 1987957-11-8 | Sofosbuvir

2′-Hydroxy Sofosbuvir
$555.00 5 mg
In Stock

CAS No.

: 1987957-11-8

Mol F.

: C22H30N3O10P

Mol W.

: 527.47

Cat No.

: SA15409

2′-S-Fluoro sofosbuvir; 2’-epi-Sofosbuvir | 1987957-28-7 | Sofosbuvir

2′-S-Fluoro sofosbuvir; 2’-epi-Sofosbuvir
$555.00 5 mg
In Stock

CAS No.

: 1987957-28-7

Mol F.

: C22H29FN3O9P

Mol W.

: 529.46

Cat No.

: SA15406

21-Carboxy Dexamethasone | 84449-15-0 | Dexamethasone

,

21-Carboxy Dexamethasone
$255.00 25 mg
In Stock

CAS No.

: 84449-15-0

Mol F.

: C22H27FO6

Mol W.

: 406.5

Cat No.

: SA15531

21-Carboxylic Acid Triamcinolone Acetonide | 53962-41-7 | Triamcinolone Acetonide

,

21-Carboxylic Acid Triamcinolone Acetonide
$395.00 25 mg
In Stock

CAS No.

: 53962-41-7

Mol F.

: C24H29FO7

Mol W.

: 448.48

Cat No.

: SA30216

21-Chlorooxenol | Hydrocortisone

,

21-Chlorooxenol
Please enquire for price & pack size
In Stock

CAS No.

Mol F.

: C21H29ClO4

Mol W.

: 380.91

Cat No.

: SA15226

21-Dehydro Dexamethasone Hydrate | 2964-79-6 | Dexamethasone

21-Dehydro Dexamethasone Hydrate
Please enquire for price & pack size
In Stock

CAS No.

: 2964-79-6

Mol F.

: C22H29FO6

Mol W.

: 408.46

Cat No.

: SA15505

21-Dehydrocortiicosterone | 20287-97-2 | Hydrocortisone

,

21-Dehydrocortiicosterone
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In Stock

CAS No.

: 20287-97-2

Mol F.

: C21H28O4

Mol W.

: 344.44

Cat No.

: SA15228

21-Dehydrocortisone | 16574-04-2 | Cortisone Acetate

,

21-Dehydrocortisone
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In Stock

CAS No.

: 16574-04-2

Mol F.

: C21H26O5

Mol W.

: 358.4

Cat No.

: SA43204

21-Dehydroxy 8DM | 59796-52-0 | Desoximetasone

,

21-Dehydroxy 8DM
Please enquire for price & pack size
In Stock

CAS No.

: 59796-52-0

Mol F.

: C22H28O4

Mol W.

: 356.46

Cat No.

: SA19210

21-Dehydroxy Desoxymetasone | 184899-80-7 | Desoximetasone

,

21-Dehydroxy Desoxymetasone
Please enquire for price & pack size
In Stock

CAS No.

: 184899-80-7

Mol F.

: C22H29FO3

Mol W.

: 360.46

Cat No.

: SA19207

21-Deoxydexamethasone | 426-15-3 | Dexamethasone

,

21-Deoxydexamethasone
Please enquire for price & pack size
In Stock

CAS No.

: 426-15-3

Mol F.

: C22H29FO4

Mol W.

: 376.47

Cat No.

: SA15532

21-O-Acetyl Dexamethasone 9,11-Epoxide | 2884-51-7 | Dexamethasone

,

21-O-Acetyl Dexamethasone 9,11-Epoxide
Please enquire for price & pack size
In Stock

CAS No.

: 2884-51-7

Mol F.

: C₂₄H₃₀O₆

Mol W.

: 414.49

Cat No.

: SA15524

2α-cyano ethisterone | 13648-12-9 | Ethisterone

,

2α-cyano ethisterone
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In Stock

CAS No.

: 13648-12-9

Mol F.

: C22H27NO2

Mol W.

: 337.45

Cat No.

: SA12901

2α-Hydroxytestosterone | 4075-14-3 | Testosterone

,

2α-Hydroxytestosterone
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In Stock

CAS No.

: 4075-14-3

Mol F.

: C19H28O3

Mol W.

: 304.42

Cat No.

: SA16218

3- Bromo Bromfenac Isomer | Bromfenac

3- Bromo Bromfenac Isomer
Please enquire for price & pack size
In Stock

CAS No.

Mol F.

: C15H11BrNNaO3

Mol W.

: 356.15

Cat No.

: SA18915

3-(methyl amino)phenol | 14703-69-6 | Neostigmine

,

3-(methyl amino)phenol
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In Stock

CAS No.

: 14703-69-6

Mol F.

: C7H9NO

Mol W.

: 123.155

Cat No.

: SA19704

3-Aminophthalic acid hydrochloride | 5434-20-8 | Apremilast

,

3-Aminophthalic acid hydrochloride
$79.00 25 mg
In Stock

CAS No.

: 5434-20-8

Mol F.

: C8H8ClNO4

Mol W.

: 217.61

Cat No.

: SA30016

3-Boc-amino-4-2, 4, 5-trifluorophenyl)butyric Acid | 1620129-74-9 | Sitagliptin

,

3-Boc-amino-4-2, 4, 5-trifluorophenyl)butyric Acid
$355.00 1 g
In Stock

CAS No.

: 1620129-74-9

Mol F.

: C15H18F3NO4

Mol W.

: 333.3

Cat No.

: SA10457

3-Chlorobenzotrichloride | 2136-81-4 | Clotrimazole

,

3-Chlorobenzotrichloride
Please enquire for price & pack size
In Stock

CAS No.

: 2136-81-4

Mol F.

: C7H4Cl4

Mol W.

: 229.92

Cat No.

: SA11602

3-Chloroiminodibenzyl | 32943-25-2 | Clomipramine

,

3-Chloroiminodibenzyl
$95.00 25 mg
In Stock

CAS No.

: 32943-25-2

Mol F.

: C14H12ClN

Mol W.

: 229.7

Cat No.

: SA33703

3-Chloropropiophenone | 936-59-4 | Bupropion

,

3-Chloropropiophenone
$90.00 50 mg
In Stock

CAS No.

: 936-59-4

Mol F.

: C9H9ClO

Mol W.

: 168.62

Cat No.

: SA12232

3-Enol Ether Cortisone Acetate | 1852-65-9 | Cortisone Acetate

,

3-Enol Ether Cortisone Acetate
Please enquire for price & pack size
In Stock

CAS No.

: 1852-65-9

Mol F.

: C25H34O6

Mol W.

: 430.5

Cat No.

: SA43200

3-Epi Empagliflozin (R-Isomer) | 864070-43-9 | Empagliflozin

,

3-Epi Empagliflozin (R-Isomer)
$199.00 10 mg
In Stock

CAS No.

: 864070-43-9

Mol F.

: C23H27ClO7

Mol W.

: 450.91

Cat No.

: SA15113

3-Epi Empagliflozin Enantiomer (S-Isomer) | Empagliflozin

3-Epi Empagliflozin Enantiomer (S-Isomer)
$245.00 5 mg
In Stock

CAS No.

: NA

Mol F.

: C23H27ClO7

Mol W.

: 450.91

Cat No.

: SA15131

3-Ethoxy-4-methoxybenzonitrile | 60758-86-3 | Apremilast

,

3-Ethoxy-4-methoxybenzonitrile
$79.00 50 mg
In Stock

CAS No.

: 60758-86-3

Mol F.

: C10H11NO2

Mol W.

: 177.2

Cat No.

: SA30018

3-Ethynylaniline | 54060-30-9 | Erlotinib

,

3-Ethynylaniline
Please enquire for price & pack size
In Stock

CAS No.

: 54060-30-9

Mol F.

: C8H7N

Mol W.

: 117.15

Cat No.

: SA25224

3-Fluoro Atorvastatin | Atorvastatin

,

3-Fluoro Atorvastatin
$190.00 25 mg
In Stock

CAS No.

Mol F.

: C33H34FN2NaO5

Mol W.

: 580.62

Cat No.

: SA17802

3-fluro diketoatorvastatin derivative | Atorvastatin

,

3-fluro diketoatorvastatin derivative
$500.00 250 mg
In Stock

CAS No.

Mol F.

: C26H24FNO3

Mol W.

: 417.47

Cat No.

: SA17804

3-Hydroxy Sitagliptin | 1253056-01-7 | Sitagliptin

3-Hydroxy Sitagliptin
$199.00 25 mg
In Stock

CAS No.

: 1253056-01-7

Mol F.

: C16H14F6N4O2

Mol W.

: 408.3

Cat No.

: SA10406

3-hydroxy-1-adamantyl-D-glycine | 709031-29-8 | Saxagliptin

,

3-hydroxy-1-adamantyl-D-glycine
$195.00 100 mg
In Stock

CAS No.

: 709031-29-8

Mol F.

: C12H19NO3

Mol W.

: 225.28

Cat No.

: SA27418

3-hydroxy-3,4-dicarboxy-butanamide-N hexanoic acid | 1675217-42-1 | Aminocaproic Acid

,

3-hydroxy-3,4-dicarboxy-butanamide-N hexanoic acid
Please enquire for price & pack size
In Stock

CAS No.

: 1675217-42-1

Mol F.

: C12H19NO8

Mol W.

: 305.28

Cat No.

: SA22610

3-Hydroxy-4-methoxybenzonitrile | 52805-46-6 | Apremilast

,

3-Hydroxy-4-methoxybenzonitrile
$79.00 25 mg
In Stock

CAS No.

: 52805-46-6

Mol F.

: C8H7NO2

Mol W.

: 149.1

Cat No.

: SA30017

3-Methoxyphenyl-O-Desacetyl-N-desmethyl Diltiazem | Diltiazem

,

3-Methoxyphenyl-O-Desacetyl-N-desmethyl Diltiazem
$1,395.00 25 mg
In Stock

CAS No.

Mol F.

: C19H22N2O3S

Mol W.

: 358.46

Cat No.

: SA19503

3-Morpholino-1-(4-(2-oxopiperidin-1-yl)phenyl)-5,6-dihydropyridin-2(1H)-one | 545445-44-1 | Apixaban

,

3-Morpholino-1-(4-(2-oxopiperidin-1-yl)phenyl)-5,6-dihydropyridin-2(1H)-one
$145.00 25 mg
In Stock

CAS No.

: 545445-44-1

Mol F.

: C20H25N3O3

Mol W.

: 355.43

Cat No.

: SA39926

3-Morpholino-1-(4-(2-oxopiperidin-1-yl)phenyl)pyridin-2(1H)-one | 2413365-22-5 | Apixaban

,

3-Morpholino-1-(4-(2-oxopiperidin-1-yl)phenyl)pyridin-2(1H)-one
Please enquire for price & pack size
In Stock

CAS No.

: 2413365-22-5

Mol F.

: C20H23N3O3

Mol W.

: 353.41

Cat No.

: SA39948

3-Nitrophthalic acid | 603-11-2 | Apremilast

,

3-Nitrophthalic acid
$79.00 25 mg
In Stock

CAS No.

: 603-11-2

Mol F.

: C₈H₅NO₆

Mol W.

: 211.13

Cat No.

: SA30013

3-O-Allylnaloxone | 1352085-46-1 | Naloxone

3-O-Allylnaloxone
Please enquire for price & pack size
In Stock

CAS No.

: 1352085-46-1

Mol F.

: C22H25NO4

Mol W.

: 367.44

Cat No.

: SA45105

3,4-Dinitrobenzoic Acid | 528-45-0 | Brimonidine

,

3,4-Dinitrobenzoic Acid
$80.00 25 mg
In Stock

CAS No.

: 528-45-0

Mol F.

: C7H4N2O6

Mol W.

: 212.12

Cat No.

: SA20723

3,4-O-Isopropylidene Clindamycin | 147650-54-2 | Clindamycin

,

3,4-O-Isopropylidene Clindamycin
Please enquire for price & pack size
In Stock

CAS No.

: 147650-54-2

Mol F.

: C21H37ClN2O5S

Mol W.

: 465.05

Cat No.

: SA29712

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