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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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Citalopram Dihydroxy Impurity | 103146-26-5 (HBr salt); 103146-25-4 (base); 717133-25-0 (HCl Salt) | Citalopram

,

Citalopram Dihydroxy Impurity
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CAS No.

: 103146-26-5 (HBr salt); 103146-25-4 (base); 717133-25-0 (HCl Salt)

Mol F.

: C20H28BrFN2O2

Mol W.

: 427.35

Cat No.

: SA17004

Citalopram EP Impurity A; Citalopram Related Compound A | 64372-56-1 | Citalopram

,

Citalopram EP Impurity A; Citalopram Related Compound A
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CAS No.

: 64372-56-1

Mol F.

: C20H23FN2O2

Mol W.

: 342.41

Cat No.

: SA17005

Citalopram EP Impurity B | 411221-53-9 | Citalopram

,

Citalopram EP Impurity B
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CAS No.

: 411221-53-9

Mol F.

: C20H21FN2O2

Mol W.

: 340.39

Cat No.

: SA17006

Citalopram EP Impurity C; Citalopram Related Compound C | 1440961-11-4; 372941-54-3 (free base) | Citalopram

Citalopram EP Impurity C; Citalopram Related Compound C
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CAS No.

: 1440961-11-4; 372941-54-3 (free base)

Mol F.

: C20H19FN2O2 (base), C22H21FN2O6 (oxalate salt)

Mol W.

: 338.38,428.41(oxalatesalt)

Cat No.

: SA17007

Citalopram EP Impurity D | 144025-14-9; 62498-67-3 (Free base) | Citalopram

,

Citalopram EP Impurity D
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CAS No.

: 144025-14-9; 62498-67-3 (Free base)

Mol F.

: C19H20ClFN2O

Mol W.

: 346.83

Cat No.

: SA17008

Citalopram EP Impurity G | 1329745-98-3 | Citalopram

Citalopram EP Impurity G
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CAS No.

: 1329745-98-3

Mol F.

: C25H33FN2O2

Mol W.

: 412.54

Cat No.

: SA17011

Citalopram p-Chlorophenyl Impurity | Citalopram

,

Citalopram p-Chlorophenyl Impurity
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CAS No.

Mol F.

: C20H21ClN2O

Mol W.

: 340.84

Cat No.

: SA17018

Citalopram S-Isomer | 219861-08-2 | Citalopram

,

Citalopram S-Isomer
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CAS No.

: 219861-08-2

Mol F.

: C22H23FN2O5

Mol W.

: 414.43

Cat No.

: SA17015

Citalopram USP RC E; Citalopram Related Compound E | 63284-72-0 | Citalopram

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Citalopram USP RC E; Citalopram Related Compound E
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CAS No.

: 63284-72-0

Mol F.

: C20H21FN2O2

Mol W.

: 340.39

Cat No.

: SA17016

Clarithromycin N-Oxide | 118074-07-0 | Clarithromycin

,

Clarithromycin N-Oxide
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CAS No.

: 118074-07-0

Mol F.

: C38H69NO14

Mol W.

: 763.95

Cat No.

: SA17203

Clindamycin 2-Phosphate | 24729-96-2 | Clindamycin

,

Clindamycin 2-Phosphate
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CAS No.

: 24729-96-2

Mol F.

: C18H34ClN2O8PS

Mol W.

: 504.96

Cat No.

: SA29710

Clindamycin EP Impurity D; 7-Epi lincomycin | 17017-22-0 | Clindamycin

,

Clindamycin EP Impurity D; 7-Epi lincomycin
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CAS No.

: 17017-22-0

Mol F.

: C18H34N2O6S

Mol W.

: 406.54

Cat No.

: SA29713

Clindamycin Phosphate EP Impurity E | 18323-44-9; 58207-19-5 (hydrochloride hydrate) | Clindamycin

Clindamycin Phosphate EP Impurity E
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CAS No.

: 18323-44-9; 58207-19-5 (hydrochloride hydrate)

Mol F.

: C18H33ClN2O5S

Mol W.

: 424.98

Cat No.

: SA29711

Clindamycin Sulfoxide(Mixture of Diastereomers) | 22431-46-5 | Clindamycin

,

Clindamycin Sulfoxide(Mixture of Diastereomers)
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CAS No.

: 22431-46-5

Mol F.

: C₁₈H₃₃ClN₂O₆S

Mol W.

: 440.98

Cat No.

: SA29702

Clobetasol Propionate EP Impurity B | 1356190-17-4 | Clobetasol Propionate

Clobetasol Propionate EP Impurity B
$395.00 25 mg
In Stock

CAS No.

: 1356190-17-4

Mol F.

: C22H26ClFO3

Mol W.

: 392.89

Cat No.

: SA17102

Clobetasol Propionate EP Impurity C | 25122-52-5 | Clobetasol Propionate

,

Clobetasol Propionate EP Impurity C
$155.00 25 mg
In Stock

CAS No.

: 25122-52-5

Mol F.

: C25H32ClFO5

Mol W.

: 466.97

Cat No.

: SA17103

Clobetasol Propionate EP Impurity D | 25120-99-4 | Clobetasol Propionate

Clobetasol Propionate EP Impurity D
$155.00 25 mg
In Stock

CAS No.

: 25120-99-4

Mol F.

: C25H34ClFO5

Mol W.

: 468.99

Cat No.

: SA17104

Clobetasol Propionate EP Impurity G | 25122-41-2 | Clobetasol Propionate

Clobetasol Propionate EP Impurity G
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CAS No.

: 25122-41-2

Mol F.

: C22H28ClFO4

Mol W.

: 410.91

Cat No.

: SA17107

Clobetasol Propionate EP Impurity I | 15423-80-0 | Clobetasol Propionate

,

Clobetasol Propionate EP Impurity I
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CAS No.

: 15423-80-0

Mol F.

: C26H35FO8S

Mol W.

: 526.61

Cat No.

: SA17109

Clobetasol Propionate EP Impurity J | 1486466-31-2 | Clobetasol Propionate

Clobetasol Propionate EP Impurity J
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CAS No.

: 1486466-31-2

Mol F.

: C25H30ClFO4

Mol W.

: 448.95

Cat No.

: SA17110

Clomiphene EP Impurity G, H (Mixture of Z and EIsomers) | 1795130-18-5 | Clomifene

,

Clomiphene EP Impurity G, H (Mixture of Z and EIsomers)
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CAS No.

: 1795130-18-5

Mol F.

: C26H27Cl2NO

Mol W.

: 440.4

Cat No.

: SA21707

Clopidogrel Nitroso Impurity | 2460755-43-3 | Nitrosamine

, ,

Clopidogrel Nitroso Impurity
$255.00 100 mg
In Stock

CAS No.

: 2460755-43-3

Mol F.

: C7H8N2OS

Mol W.

: 168.2

Cat No.

: SA44618

Clotrimazole EP Impurity A | 66774-02-5 | Clotrimazole

,

Clotrimazole EP Impurity A
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CAS No.

: 66774-02-5

Mol F.

: C19H15ClO

Mol W.

: 294.77

Cat No.

: SA11601

Clotrimazole EP Impurity B | 23593-71-7 | Clotrimazole

,

Clotrimazole EP Impurity B
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CAS No.

: 23593-71-7

Mol F.

: C22H17ClN2

Mol W.

: 344.84

Cat No.

: SA11608

Clotrimazole EP Impurity E | 5162-03-8 | Clotrimazole

Clotrimazole EP Impurity E
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CAS No.

: 5162-03-8

Mol F.

: C13H9ClO

Mol W.

: 216.66

Cat No.

: SA11614

Clozapine | 5786-21-0 | Clozapine

Clozapine
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CAS No.

: 5786-21-0

Mol F.

: C18H19ClN4

Mol W.

: 326.8

Cat No.

: SA60000

Clozapine EP Impurity C | 6104-71-8 | Clozapine

Clozapine EP Impurity C
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CAS No.

: 6104-71-8

Mol F.

: C17H17ClN4

Mol W.

: 312.8

Cat No.

: SA60003

Clozapine N-oxide Impurity | 34233-69-7 | Clozapine

Clozapine N-oxide Impurity
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CAS No.

: 34233-69-7

Mol F.

: C18H19ClN4O

Mol W.

: 342.8

Cat No.

: SA60005

Colesevelam Hexamethonium Bromide Impurity | 55-97-0 | Colesevelam

,

Colesevelam Hexamethonium Bromide Impurity
$70.00 25 mg
In Stock

CAS No.

: 55-97-0

Mol F.

: 362.19

Mol W.

: 362.19

Cat No.

: SA10216

Cortienic Acid | 3597-45-3 | Hydrocortisone

,

Cortienic Acid
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CAS No.

: 3597-45-3

Mol F.

: C20H28O5

Mol W.

: 348.43

Cat No.

: SA15232

Cortisone 17-Valerate | 136370-31-5 | Hydrocortisone Valerate

,

Cortisone 17-Valerate
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CAS No.

: 136370-31-5

Mol F.

: C26H36O6

Mol W.

: 444.56

Cat No.

: SA27302

Cortisone 21-acetate | 50-04-4 | Cortisone Acetate

,

Cortisone 21-acetate
$95.00 25 mg
In Stock

CAS No.

: 50-04-4

Mol F.

: C23H30O6

Mol W.

: 402.48

Cat No.

: SA43205

Cortisone 21-Hemisuccinate | 10215-75-5 | Hydrocortisone

Cortisone 21-Hemisuccinate
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CAS No.

: 10215-75-5

Mol F.

: C25H32O8

Mol W.

: 460.52

Cat No.

: SA15243

Cortisone 21-Valerate | 119698-10-1 | Hydrocortisone Valerate

,

Cortisone 21-Valerate
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CAS No.

: 119698-10-1

Mol F.

: C26H36O6

Mol W.

: 444.56

Cat No.

: SA27301

Cortisone hemisuccinate | Hydrocortisone

,

Cortisone hemisuccinate
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CAS No.

Mol F.

: C25H34O8

Mol W.

: 462.53

Cat No.

: SA15219

Crisaborole | 906673-24-3 | Crisaborole

,

Crisaborole
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CAS No.

: 906673-24-3

Mol F.

: C14H10BNO3

Mol W.

: 251.05

Cat No.

: SA49600

Cyclobenzaprine N-Oxide | 6682-26-4 | Cyclobenzaprine

,

Cyclobenzaprine N-Oxide
$150.00 25 mg
In Stock

CAS No.

: 6682-26-4

Mol F.

: C20H21NO

Mol W.

: 291.39

Cat No.

: SA23105

Cyproheptadine Hydrochloride | 969-33-5 | Cyproheptadine

,

Cyproheptadine Hydrochloride
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CAS No.

: 969-33-5

Mol F.

: C21H22ClN

Mol W.

: 323.860

Cat No.

: SA53800

Cytidine ester | 886538-46-1 | Molnupiravir

,

Cytidine ester
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CAS No.

: 886538-46-1

Mol F.

: C13H19N3O6

Mol W.

: 313.31

Cat No.

: SA46206

D-Alanine | 338-69-2 | Tenofovir

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D-Alanine
$99.00 1 g
In Stock

CAS No.

: 338-69-2

Mol F.

: C3H7NO2

Mol W.

: 89.09

Cat No.

: SA36932

D-Glucono-1,4-lactone | 1198-69-2 | Empagliflozin

,

D-Glucono-1,4-lactone
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CAS No.

: 1198-69-2

Mol F.

: C6H10O6

Mol W.

: 178.1

Cat No.

: SA15140

D-Home-BD-06; impurity 4 | Budesonide

,

D-Home-BD-06; impurity 4
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In Stock

CAS No.

Mol F.

: C21H28O6

Mol W.

: 376.44

Cat No.

: SA14133

Dacarbazine EP Impurity A | 1797817-35-6 | Dacarbazine

,

Dacarbazine EP Impurity A
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CAS No.

: 1797817-35-6

Mol F.

: C4H3N5O

Mol W.

: 137.1

Cat No.

: SA38801

Dacarbazine Lactose Adduct | NA | Dacarbazine

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Dacarbazine Lactose Adduct
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CAS No.

: NA

Mol F.

: C16H26N4O11

Mol W.

: 450.4

Cat No.

: SA38805

Dapagliflozin 1-Bromo-2-Chlorobenzene Impurity | Dapagliflozin

,

Dapagliflozin 1-Bromo-2-Chlorobenzene Impurity
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CAS No.

: NA

Mol F.

: C15H14BrClO

Mol W.

: 325.63

Cat No.

: SA15076

Dapagliflozin 1-Bromo, 4-Chlorobenzene Impurity | CAS : 1629862-21-0 | 1629862-21-0 | Dapagliflozin

,

Dapagliflozin 1-Bromo, 4-Chlorobenzene Impurity | CAS : 1629862-21-0
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CAS No.

: 1629862-21-0

Mol F.

: C15H14BrClO

Mol W.

: 325.63

Cat No.

: SA15074

Dapagliflozin 1,4- Anhydro impurity; Dapagliflozin Beta furanose S3B | 1469910-70-0 | Dapagliflozin

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Dapagliflozin 1,4- Anhydro impurity; Dapagliflozin Beta furanose S3B
$385.00 25 mg
In Stock

CAS No.

: 1469910-70-0

Mol F.

: C21H25ClO6

Mol W.

: 408.87

Cat No.

: SA15023

Dapagliflozin 2-Bromo, 1-Chlorobenzene Impurity | Dapagliflozin

,

Dapagliflozin 2-Bromo, 1-Chlorobenzene Impurity
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CAS No.

Mol F.

: C15H14BrClO

Mol W.

: 325.63

Cat No.

: SA15075

Dapagliflozin 4-Acetyl imurity | Dapagliflozin

,

Dapagliflozin 4-Acetyl imurity
$210.00 10 mg
In Stock

CAS No.

Mol F.

: C23H27ClO7

Mol W.

: 450.91

Cat No.

: SA15047

Dapagliflozin 4-bromo-2-chlorobenzene Impurity | CAS : 2454263-77-3 | 2454263-77-3 | Dapagliflozin

,

Dapagliflozin 4-bromo-2-chlorobenzene Impurity | CAS : 2454263-77-3
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CAS No.

: 2454263-77-3

Mol F.

: C15H14BrClO

Mol W.

: 325.63

Cat No.

: SA15077

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