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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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Impurities, Zidovudine

Zidovudine EP Impurity C

$70.00 25 mg

In Stock

CAS No.

: 65-71-4

Mol F.

: C5H6N2O2

Mol W.

: 126.11

Cat No.

: SA12605

Zolmitriptan

Zolmitriptan EP impurity C | CAS : 1350928-05-0

$295.00 5 mg

In Stock

CAS No.

: 1350928-05-0

Mol F.

: C38H53N7O4

Mol W.

: 671.87

Cat No.

: SA11910

Impurities, Zolmitriptan

Zolmitriptan Hydroxymethyl Impurity (USP)

$150.00 10 mg

In Stock

CAS No.

Mol F.

: C17H23N3O3

Mol W.

: 317.4

Cat No.

: SA11909

Impurities, Zolmitriptan

Zolmitriptan N-Oxide

$195.00 25 mg

In Stock

CAS No.

: 251451-30-6

Mol F.

: C16H21N3O3

Mol W.

: 303.36

Cat No.

: SA11903

Impurities, Zolmitriptan

Zolmitriptan R-Isomer

$255.00 50 mg

In Stock

CAS No.

: 139264-24-7

Mol F.

: C16H21N3O2

Mol W.

: 287.36

Cat No.

: SA11901

Impurities, Zolmitriptan

Zolmitriptan USP Related Compound A

$100.00 10 mg

In Stock

CAS No.

: 139264-35-0

Mol F.

: C15H19N3O2

Mol W.

: 273.33

Cat No.

: SA11904

Impurities, Zolmitriptan

Zolmitriptan USP Related Compound B; Zolmitriptan EP Impurity F

$295.00 50 mg

In Stock

CAS No.

: 139264-69-0

Mol F.

: C15H23N3O

Mol W.

: 261.36

Cat No.

: SA11905

Brivaracetam, Impurities

αR-Brivaracetam

$395.00 25 mg

In Stock

CAS No.

: 357337-00-9

Mol F.

: C11H20N2O2

Mol W.

: 212.3

Cat No.

: SA47304

Brivaracetam, Impurities

αR,4S-Brivaracetam

$395.00 25 mg

In Stock

CAS No.

: 357336-99-3

Mol F.

: C11H20N2O2

Mol W.

: 212.29

Cat No.

: SA47302

Propranolol

β-Naphthol

$99.00 1 g

In Stock

CAS No.

: 135-19-3

Mol F.

: C10H8O

Mol W.

: 144.173

Cat No.

: SA24614

Fluorometholone, Impurities

Δ-16(17)-Fluorometholone

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C22H27FO3

Mol W.

: 358.45

Cat No.

: SA38413

Fluorometholone, Impurities

Δ-9(11)-Fluorometholone

Please enquire for price & pack size

In Stock

CAS No.

: 110664-42-1

Mol F.

: C22H28O3

Mol W.

: 340.45

Cat No.

: SA38412

Hydrocortisone Valerate, Impurities

Δ9(11)-Hydrocortisone-17-valerate

Please enquire for price & pack size

In Stock

CAS No.

: NA

Mol F.

: C26H36O5

Mol W.

: 428.56

Cat No.

: SA27306

Impurities, Lamivudine

(±)-Trans-lamivudine (Mixture of Diastereomers)

Please enquire for price & pack size

Limited Stock

CAS No.

: 141434-39-1

Mol F.

: C8H11N3O3S

Mol W.

: 229.3

Cat No.

: SA22322

Impurities, Tadalafil

(1S, 3S) Open Ring Tadalafil Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 629652-42-2

Mol F.

: C₂₂H₁₉ClN₂O₅

Mol W.

: 426.85

Cat No.

: SA20904

Impurities, Lamivudine

(2R,5S)-L-Menthol-5-(4-amino-2-oxo-1(2H)-pyrimidinyl)-1,3-oxathiolane-2-carboxylate

Please enquire for price & pack size

Limited Stock

CAS No.

: 147027-10-9

Mol F.

: C₁₈H₂₇N₃O₄S

Mol W.

: 381.49

Cat No.

: SA22308

Impurities, Norethindrone

∆-5(10)-Norethindrone Acetate; Norethisterone Acetate EP Impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 19637-28-6

Mol F.

: C22H28O3

Mol W.

: 340.46

Cat No.

: SA13401

Clotrimazole, Impurities

1-chloro-2-(dichloromethyl)benzene

Please enquire for price & pack size

Limited Stock

CAS No.

: 88-66-4

Mol F.

: C7H5Cl3

Mol W.

: 195.46

Cat No.

: SA11603

Fluorometholone, Impurities

1,2-dihydro Fluorometholone

Please enquire for price & pack size

Limited Stock

CAS No.

: 378-36-9

Mol F.

: C22H31FO4

Mol W.

: 378.48

Cat No.

: SA38410

Betamethasone Dipropionate, Impurities

1,2-Dihydro-Betamethasone

$195.00 25 mg

Limited Stock

CAS No.

: 560-34-9

Mol F.

: C22H31FO5

Mol W.

: 394.48

Cat No.

: SA14511

Impurities, Triamcinolone Acetonide

1,2-Dihydrotriamcinolone

$95.00 25 mg

Limited Stock

CAS No.

Mol F.

: C21H29FO6

Mol W.

: 396.45

Cat No.

: SA30215

Oxcarbazepine

11-Keto Oxcarbazepine; Oxcarbazepine EP Impurity I

$295.00 25 mg

Limited Stock

CAS No.

: 537693-29-1

Mol F.

: C15H10N2O3

Mol W.

: 266.25

Cat No.

: SA12501

Budesonide, Impurities

16-HPA Impurity N-2

$395.00 25 mg

Limited Stock

CAS No.

Mol F.

: C23H28O6

Mol W.

: 400.46

Cat No.

: SA14130

Impurities, Raloxifene

2-(4-Hydroxyphenyl)benzo[b]thiophen-6-ol Bimesylate

Please enquire for price & pack size

Limited Stock

CAS No.

: 84449-65-0

Mol F.

: C16H14O6S3

Mol W.

: 398.47

Cat No.

: SA24923

Emtricitabine

2-epi-Emtricitabine; Emtricitabine 2-Epimer

$245.00 5 mg

Limited Stock

CAS No.

: 145416-34-8

Mol F.

: C₈H₁₀FN₃O₃S

Mol W.

: 247.25

Cat No.

: SA22903

Etravirine, Impurities

3-Amino bromo Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

: 1398507-09-9

Mol F.

: C11H7BrClN5

Mol W.

: 324.56

Cat No.

: SA26109

Aspirin, Impurities

4-Hydroxyisophthalic Acid

Please enquire for price & pack size

Limited Stock

CAS No.

: 636-46-4

Mol F.

: C8H6O5

Mol W.

: 182.13

Cat No.

: SA28511

Impurities, Uracil

5-Methoxypyrimidine-4,6-diol

Please enquire for price & pack size

Limited Stock

CAS No.

: 5193-84-0

Mol F.

: C5H6N2O3

Mol W.

: 142.11

Cat No.

: SA45301

Exemestane, Impurities

6 beta-methoxymethyl exemestane imp

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C21H26O3

Mol W.

: 326.43

Cat No.

: SA19128

Estradiol, Impurities

6-Dehydro Estradiol 17-Valerate; Estradiol Valerate Impurity G

Please enquire for price & pack size

Limited Stock

CAS No.

: 1313382-25-0

Mol F.

: C₂₃H₃₀O₃

Mol W.

: 354.48

Cat No.

: SA13209

Exemestane, Impurities

6-Formyl-17α-hydroxy Exemestane Impurity

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C20H24O3

Mol W.

: 312.4

Cat No.

: SA19112

Impurities, Testosterone

6-Keto-testosterone Cypionate

Please enquire for price & pack size

Limited Stock

CAS No.

Mol F.

: C27H38O4

Mol W.

: 426.59

Cat No.

: SA16213

Hydrocortisone Valerate, Impurities

6-αβ-hydroxyhydrocorti-21-Valerate

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C26H38O7

Mol W.

: 462.57

Cat No.

: SA27314

Hydrocortisone Valerate, Impurities

6(α/β)-Hydroxy-hydrocortisone-17-valerate

Please enquire for price & pack size

Limited Stock

CAS No.

: NA

Mol F.

: C26H38O7

Mol W.

: 462.57

Cat No.

: SA27308

Bromfenac, Impurities

7-(4-Bromobenzoyl)-3,3-dibromo-1,3-dihydro-2H-indol-2-one

Please enquire for price & pack size

Limited Stock

CAS No.

: 1797880-03-5

Mol F.

: C15H8Br3NO2

Mol W.

: 473.94

Cat No.

: SA18912

Impurities, Prazosin

7-O-Desmethyl Prazosin

Please enquire for price & pack size

Limited Stock

CAS No.

: 60548-06-3

Mol F.

: C18H19N5O4

Mol W.

: 369.37

Cat No.

: SA24209

Amlodipine

Amlodipine (S)-Isomer

$75.00 25 mg

PLEASE ENQUIRE

CAS No.

: 103129-82-4

Mol F.

: C20H25ClN2O5

Mol W.

: 408.88

Cat No.

: SA30501

Amoxicillin, Impurities

Amoxicillin EP Impurity F

Please enquire for price & pack size

Limited Stock

CAS No.

: 126247-63-0

Mol F.

: C10H8N2O2

Mol W.

: 188.2

Cat No.

: SA15316

Azathioprine, Impurities

Azathioprine EP Impurity A

Please enquire for price & pack size

Limited Stock

CAS No.

: 4531-54-8

Mol F.

: C4H6N4O2

Mol W.

: 142.12

Cat No.

: SA17902

Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate EP Impurity F

$145.00 25 mg

Limited Stock

CAS No.

: 66917-44-0

Mol F.

: C28H36O7

Mol W.

: 484.58

Cat No.

: SA14509

Betamethasone Dipropionate, Impurities

Betamethasone Dipropionate EP Impurity H

$195.00 25 mg

Limited Stock

CAS No.

: 1186048-34-9

Mol F.

: C28H36BrFO7

Mol W.

: 583.48

Cat No.

: SA14508

Betamethasone Valerate

Betamethasone Valerate EP Impurity F

$395.00 25 mg

In Stock

CAS No.

: 16125-28-3

Mol F.

: C27H36O5

Mol W.

: 440.57

Cat No.

: SA18509

Brimonidine, Impurities

Brimonidine 2-oxo and 3-oxo (1:1) Impurity

$350.00 25 mg

Limited Stock

CAS No.

Mol F.

: C11H10BrN5O

Mol W.

: 308.13

Cat No.

: SA20702

Bromhexine, Impurities

Bromhexine EP Impurity D

Please enquire for price & pack size

Limited Stock

CAS No.

: 132004-28-5

Mol F.

: C14H21BrN2

Mol W.

: 297.23

Cat No.

: SA28404

Budesonide, Impurities

Budesonide (22S)-Isomer

$395.00 25 mg

Limited Stock

CAS No.

: 51372-28-2

Mol F.

: C25H34O6

Mol W.

: 430.53

Cat No.

: SA14114

Buspirone, Impurities

Buspirone EP Impurity G

$100.00 25 mg

Limited Stock

CAS No.

: 84746-24-7

Mol F.

: C12H14N6

Mol W.

: 242.28

Cat No.

: SA25806

Cangrelor, Impurities

Cangrelor Phosphate Impurity

$395.00 25 mg

Limited Stock

CAS No.

: 847460-53-1

Mol F.

: C₁₆H₂₃F₃N₅O₇PS₂

Mol W.

: 549.48

Cat No.

: SA29404

Carbamazepine, Impurities

Carbamazepine EP Impurity G

$95.00 25 mg

Limited Stock

CAS No.

: 59690-97-0

Mol F.

: C15H11BrN2O

Mol W.

: 315.16

Cat No.

: SA20313

Carisoprodol, Impurities

Carisoprodol EP Impurity B

Please enquire for price & pack size

Limited Stock

CAS No.

: 7148-50-7

Mol F.

: C₈H₁₄O₃

Mol W.

: 158.19

Cat No.

: SA25303

Carisoprodol, Impurities

Carisoprodol USP Related Compound A

Please enquire for price & pack size

Limited Stock

CAS No.

: 1471-56-3

Mol F.

: C₈H₁₇NO₃

Mol W.

: 175.23

Cat No.

: SA25300