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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, Nitrosamine

1-Methyl-4-nitrosopiperazine

Please enquire for price & pack size

In Stock

CAS No.

: 16339-07-4

Mol F.

: C5H11N3O

Mol W.

: 129.16

Cat No.

: SA446104

Impurities, Propranolol

1-Naphthol

Please enquire for price & pack size

In Stock

CAS No.

: 90-15-3

Mol F.

: C₁₀H₈O

Mol W.

: 144.16999999999999

Cat No.

: SA24611

Impurities, Irganox

1-Octadecanal

Please enquire for price & pack size

In Stock

CAS No.

: 638-66-4

Mol F.

: C18H36O

Mol W.

: 268.49

Cat No.

: SA11104

Edoxaban, Impurities

1,1,3,3-Tetramethylurea

Please enquire for price & pack size

In Stock

CAS No.

: 632-22-4

Mol F.

: C5H12N2O

Mol W.

: 116.16

Cat No.

: SA33049

Impurities, Loteprednol

1,2 dihydro diethy carbonate Loteprednol

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C26H36O9

Mol W.

: 492.56

Cat No.

: SA27600

Beclomethasone Dipropionate, Impurities

1,2-Dihydro Beclomethasone Dipropionate

$195.00 25 mg

In Stock

CAS No.

: 114371-33-4

Mol F.

: C28H39ClO7

Mol W.

: 523.06

Cat No.

: SA15606

Desoximetasone, Impurities

1,2-Dihydro Desoxymetasone

Please enquire for price & pack size

In Stock

CAS No.

: 432-54-2

Mol F.

: C22H31FO4

Mol W.

: 378.48

Cat No.

: SA19206

Dutasteride, Impurities

1,2-Dihydro Dutasteride Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 164656-22-8

Mol F.

: C27H32F6N2O2

Mol W.

: 530.54

Cat No.

: SA35219

Exemestane, Impurities

1,2-Dihydro Exemestane

Please enquire for price & pack size

In Stock

CAS No.

: 19457-55-7

Mol F.

: C₂₀H₂₆O₂

Mol W.

: 298.42

Cat No.

: SA19109

Impurities, Loteprednol

1,2-Dihydro Loteprednol etabonate

Please enquire for price & pack size

In Stock

CAS No.

: 82034-20-6

Mol F.

: C24H33ClO7

Mol W.

: 468.97

Cat No.

: SA27601

Betamethasone Dipropionate, Impurities

1,2-Dihydro-Betamethasone 17,21-Dipropionate

$295.00 25 mg

In Stock

CAS No.

: 80163-83-3

Mol F.

: C28H39FO7

Mol W.

: 506.6

Cat No.

: SA14502

Desonide, Impurities

1,2-Dihydrodesonide

Please enquire for price & pack size

In Stock

CAS No.

: 638-93-7

Mol F.

: C₂₄H₃₄O₆

Mol W.

: 418.52

Cat No.

: SA19009

Halcinonide, Impurities

1,2-DihydroTriamcinolone-16,17-Acetonide-21-Mesylate

$295.00 25 mg

In Stock

CAS No.

: 2367-73-9

Mol F.

: C25H35FO8S

Mol W.

: 514.6

Cat No.

: SA30419

Halcinonide, Impurities

1,2-DihydroTriamcinolone-16,17-Acetonide; Triamcinolone Acetonide EP Impurity E

Please enquire for price & pack size

In Stock

CAS No.

: 1524-86-3

Mol F.

: C24H33FO6

Mol W.

: 436.51

Cat No.

: SA30420

Exemestane, Impurities

1,2-epoxy Exemestane

Please enquire for price & pack size

In Stock

CAS No.

: 159354-61-7

Mol F.

: C20H24O3

Mol W.

: 312.41000000000003

Cat No.

: SA19117

Gemcitabine, Impurities

1,2:5,6-Di-O-isopropylidene-D-glucitol

Please enquire for price & pack size

In Stock

CAS No.

: 53735-98-1

Mol F.

: C12H22O6

Mol W.

: 262.3

Cat No.

: SA44503

Impurities, Nintedanib

1,3-Dimethyl 2-[4-(methoxycarbonyl)-2-nitrophenyl]propanedioate

Please enquire for price & pack size

In Stock

CAS No.

: 1160293-27-5

Mol F.

: C13H13NO8

Mol W.

: 311.24

Cat No.

: SA22520

Dapagliflozin, Impurities

1,4-Dibromo-2-(4-ethoxybenzyl)benzene

$199.00 25 mg

In Stock

CAS No.

: 1807632-93-4

Mol F.

: C15H14Br2O

Mol W.

: 370.08

Cat No.

: SA15061

Chlorpromazine, Impurities

10-(3-chloropropyl)-10H-phenothiazine

$125.00 25 mg

In Stock

CAS No.

: 5909-59-1

Mol F.

: C15H14ClNS

Mol W.

: 275.8

Cat No.

: SA21604

Carbamazepine, Impurities

10-bromo-10,11-dihydro- 5H-Dibenz[b,f]azepine – f]azepine-5-carbonyl chloride

$195.00 25 mg

In Stock

CAS No.

: 33948-20-8

Mol F.

: C15H11BrClNO

Mol W.

: 336.61

Cat No.

: SA20304

Carbamazepine, Impurities

10-Methoxy Carbamazepine; Oxcarbazepine EP Impurity B

$95.00 25 mg

In Stock

CAS No.

: 28721-09-7

Mol F.

: C16H14N2O2

Mol W.

: 266.29

Cat No.

: SA20326

Impurities, Levonorgestrel

10-α-Hydroxy Levonorgestrel

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C21H28O3

Mol W.

: 328.45

Cat No.

: SA23728

Impurities, Naloxone

10β-Hydroxynaloxone

Please enquire for price & pack size

In Stock

CAS No.

: 2139253-69-1

Mol F.

: C19H21NO5

Mol W.

: 343.37

Cat No.

: SA45109

Clobetasol Propionate, Impurities

11 Keto Clobetasol Propionate

$155.00 25 mg

In Stock

CAS No.

: 25122-56-9

Mol F.

: C25H30ClFO5

Mol W.

: 464.95

Cat No.

: SA17113

Dexamethasone, Impurities

11-Desoxy 9-des fluoro Dexamethasone Impurity

Please enquire for price & pack size

In Stock

CAS No.

: 19784-87-3

Mol F.

: C₂₂H₃₀O₄

Mol W.

: 358.47

Cat No.

: SA15525

Impurities, Prednisolone

11-desoxyprednisolone hemisuccinate

$395.00 25 mg

In Stock

CAS No.

Mol F.

: C25H32O7

Mol W.

: 444.52

Cat No.

: SA16719

Dexamethasone, Impurities

11-Epi Dexamethasone

$995.00 25 mg

In Stock

CAS No.

: 78761-59-8

Mol F.

: C22H30O5

Mol W.

: 374.47

Cat No.

: SA15526

Hydrocortisone, Impurities

11-Epihydrocortisone

Please enquire for price & pack size

In Stock

CAS No.

: 566-35-8

Mol F.

: C21H30O5

Mol W.

: 362.46

Cat No.

: SA15212

Impurities, Loteprednol

11-Keto 17-carboxylic acid Loteprednol etabonate

$195.00 25 mg

In Stock

CAS No.

: 78261-67-3

Mol F.

: C20H24O5

Mol W.

: 344.4

Cat No.

: SA27607

Impurities, Loteprednol

11-Keto Loteprednol etabonate

Please enquire for price & pack size

In Stock

CAS No.

: 207670-54-0

Mol F.

: C24H29ClO7

Mol W.

: 464.93

Cat No.

: SA27602

Budesonide, Impurities

11-Keto-BD-05; Impurity 1

$495.00 25 mg

In Stock

CAS No.

: 3949-79-9

Mol F.

: C23H28O7

Mol W.

: 416.46

Cat No.

: SA14132

Hydrocortisone Valerate, Impurities

11-Ketotestosterone

Please enquire for price & pack size

In Stock

CAS No.

: 564-35-2

Mol F.

: C19H26O3

Mol W.

: 302.41

Cat No.

: SA27310

Dexamethasone, Impurities

11-O-Formyl 21- Ethyl formate Dexamethasone

$395.00 25 mg

In Stock

CAS No.

: 192447-02-2

Mol F.

: C26H33BrO8

Mol W.

: 553.44

Cat No.

: SA15527

Hydrocortisone Valerate, Impurities

11-β-Hydroxyandrostenedione

Please enquire for price & pack size

In Stock

CAS No.

: 382-44-5

Mol F.

: C19H26O3

Mol W.

: 302.41

Cat No.

: SA27311

Hydrocortisone, Impurities

11b,17-dihydroxy-3-oxo-androst4-ene-17-carboxylic acid

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

Mol W.

Cat No.

: SA15222

Impurities, Loteprednol

11β-Hydroxy-1,4-dien-3,17-androstendione

Please enquire for price & pack size

In Stock

CAS No.

: 898-84-0

Mol F.

: C19H24O3

Mol W.

: 300.39

Cat No.

: SA27616

Budesonide, Impurities

14,15-dehydro-BD-06; Impurity 5

$795.00 25 mg

In Stock

CAS No.

: 131918-73-5

Mol F.

: C21H26O6

Mol W.

: 374.43

Cat No.

: SA14134

Desoximetasone, Impurities

16-Beta Isomer Desoximetasone imp

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C21H27FO4

Mol W.

: 362.43

Cat No.

: SA19209

Impurities, Prednisone

16α-Hydroxy Prednisone

Please enquire for price & pack size

In Stock

CAS No.

: 3754-05-0

Mol F.

: C21H26O6

Mol W.

: 374.43

Cat No.

: SA26218

Dexamethasone, Impurities

17-Oxo Dexamethasone

$175.00 25 mg

In Stock

CAS No.

: 1880-61-1

Mol F.

: C20H25FO3

Mol W.

: 332.41

Cat No.

: SA15513

Impurities, Loteprednol

17-β hydroxyacid Loteprednol

Please enquire for price & pack size

In Stock

CAS No.

: 37927-29-0

Mol F.

: C20H26O

Mol W.

: 346.42

Cat No.

: SA27604

Hydrocortisone, Impurities

17α-Hydroxy-11-deoxycorticosterone-21-acetate

$95.00 25 mg

In Stock

CAS No.

: 640-87-9

Mol F.

: C23H32O5

Mol W.

: 388.5

Cat No.

: SA15210

Dexamethasone, Impurities

17β-Carboxy-17-desoxy Dexamethasone

Please enquire for price & pack size

In Stock

CAS No.

: 75262-69-0

Mol F.

: C₂₁H₂₇FO₄

Mol W.

: 362.44

Cat No.

: SA15502

Dexamethasone, Impurities

17β-Carboxy-17α-formyloxy Dexamethasone

Please enquire for price & pack size

In Stock

CAS No.

: 473273-04-0

Mol F.

: C₂₂H₂₇FO₆

Mol W.

: 406.44

Cat No.

: SA15512

Aprepitant, Impurities

1R, 2S, 3R-CAH impurity

$480.00 25 mg

In Stock

CAS No.

: 2475187-95-0 (HCl salt)

Mol F.

: C20H19ClF7NO2

Mol W.

: 473.81

Cat No.

: SA43703

Benazepril, Impurities

1R,3S Benazepril

$390.00 25 mg

In Stock

CAS No.

: 86541-77-7 (HCl salt); 86541-76-6 (Free base)

Mol F.

: C24H28N2O5

Mol W.

: 424.49

Cat No.

: SA29610

Aprepitant, Impurities

1S, 2R, 3S-CAH impurity

$390.00 25 mg

In Stock

CAS No.

: 170729-79-0 (Base)

Mol F.

: C20H18F7NO2

Mol W.

: 437.35

Cat No.

: SA43704

Benazepril, Impurities

1S,3R Benazepril

$395.00 25 mg

In Stock

CAS No.

: 215447-90-8; 131064-74-9

Mol F.

: C24H28N2O5

Mol W.

: 424.49

Cat No.

: SA29611

Dapagliflozin, Impurities

1α-Methoxy Dapagliflozin C-2 Epimer

Please enquire for price & pack size

In Stock

CAS No.

Mol F.

: C22H27ClO7

Mol W.

: 438.9

Cat No.

: SA15025

Bromfenac, Impurities

2- Bromo bromfenac isomer

Please enquire for price & pack size

In Stock

CAS No.

: 748735-66-2 (Free acid)

Mol F.

: C15H11BrNNaO3

Mol W.

: 356.15

Cat No.

: SA18914