• FREE Worldwide Shipping*
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors
RFQ List 0
Enquiry / RFQ
Generic selectors
Exact matches only
Search in title
Search in content
Post Type Selectors

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.

ABCDEFGHIJKLMNOPQRSTUVWXYZ
((2R,3S,4R,5R)-3,4-dihydroxy- 5-((E)-(4-(hydroxyamino)-2- oxo-3,4-dihydropyrimidin- 1(2H)-yl)tetrahydrofuran-2- yl)methyl isobutyrate | 2492423-30-8 | Molnupiravir

,

((2R,3S,4R,5R)-3,4-dihydroxy- 5-((E)-(4-(hydroxyamino)-2- oxo-3,4-dihydropyrimidin- 1(2H)-yl)tetrahydrofuran-2- yl)methyl isobutyrate
In Stock

CAS No.

: 2492423-30-8

Mol F.

: C13H19N3O7

Mol W.

: 329.31

Cat No.

: SA46219

((S)-4-Phenyloxazolidin-2-one) | 99395-88-7 | Ezetimibe

,

((S)-4-Phenyloxazolidin-2-one)
In Stock

CAS No.

: 99395-88-7

Mol F.

: C9H9NO2

Mol W.

: 163.18

Cat No.

: SA14825

(−)-Scopolamine hydrobromide trihydrate | 6533-68-2 | Tiotropium

(−)-Scopolamine hydrobromide trihydrate
In Stock

CAS No.

: 6533-68-2

Mol F.

: C17H28BrNO7

Mol W.

: 438.31

Cat No.

: SA11713

(1’R,2S,3R)-Fosaprepitant Dimeglumine | Fosaprepitant

(1’R,2S,3R)-Fosaprepitant Dimeglumine
In Stock

CAS No.

Mol F.

: C37H56F7N6O16P

Mol W.

: 1004.83

Cat No.

: SA45415

(1’S,2R,3S)-Fosaprepitant Dimeglumine | Fosaprepitant

(1’S,2R,3S)-Fosaprepitant Dimeglumine
In Stock

CAS No.

Mol F.

: C37H56F7N6O16P

Mol W.

: 1004.83

Cat No.

: SA45416

(11Beta)-11-Chloro Mometasone Impurity | 83880-66-4 | Mometasone

(11Beta)-11-Chloro Mometasone Impurity
In Stock

CAS No.

: 83880-66-4

Mol F.

: C27H29Cl3O5

Mol W.

: 539.9

Cat No.

: SA28726

(17α)-19-Norpregn-5-en-20-yne-3,17-diol | 1492-41-7 | Norethindrone

,

(17α)-19-Norpregn-5-en-20-yne-3,17-diol
In Stock

CAS No.

: 1492-41-7

Mol F.

: C20H28O2

Mol W.

: 300.44

Cat No.

: SA13437

(17β)-3,17-Bis[(tetrahydro-2H-pyran-2-yl)oxy]-estra-1,3,5(10)-trien-6-ol | 122566-22-7 | Estradiol

,

(17β)-3,17-Bis[(tetrahydro-2H-pyran-2-yl)oxy]-estra-1,3,5(10)-trien-6-ol
In Stock

CAS No.

: 122566-22-7

Mol F.

: C₂₈H₄₀O₅

Mol W.

: 456.61

Cat No.

: SA13206

(1R, 3S) Methyl ester Tadalafil Impurity | 171596-44-4 | Tadalafil

,

(1R, 3S) Methyl ester Tadalafil Impurity
In Stock

CAS No.

: 171596-44-4

Mol F.

: C₂₀H₁₈N₂O₄

Mol W.

: 350.37

Cat No.

: SA20903

(1R, 3S) Open Ring Tadalafil Impurity | 629652-44-4 | Tadalafil

,

(1R, 3S) Open Ring Tadalafil Impurity
In Stock

CAS No.

: 629652-44-4

Mol F.

: C₂₂H₁₉ClN₂O₅

Mol W.

: 426.85

Cat No.

: SA20906

(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl(2R,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate | 147126-80-5 | Lamivudine

,

(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl(2R,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate
In Stock

CAS No.

: 147126-80-5

Mol F.

: C18H27N3O4S

Mol W.

: 381.5

Cat No.

: SA22318

(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl(2S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate | 200396-21-0 | Lamivudine

,

(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl(2S,5R)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate
In Stock

CAS No.

: 200396-21-0

Mol F.

: C18H27N3O4S

Mol W.

: 381.5

Cat No.

: SA22319

(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl(2S,5S)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate | NA | Lamivudine

,

(1R,2S,5R)-2-isopropyl-5-methylcyclohexyl(2S,5S)-5-(4-amino-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate
In Stock

CAS No.

: NA

Mol F.

: C18H27N3O4S

Mol W.

: 381.5

Cat No.

: SA22320

(1R)-1,5-Dihydroxyempagliflozin | 1620758-34-0 | Empagliflozin

,

(1R)-1,5-Dihydroxyempagliflozin
In Stock

CAS No.

: 1620758-34-0

Mol F.

: C23H29ClO8

Mol W.

: 468.92

Cat No.

: SA15112

(1S-cis) Methyl ester Tadalafil Impurity | 171596-43-3 | Tadalafil

,

(1S-cis) Methyl ester Tadalafil Impurity
In Stock

CAS No.

: 171596-43-3

Mol F.

: C₂₀H₁₈N₂O₄

Mol W.

: 350.37

Cat No.

: SA20901

(1S, 3R) Methyl ester Tadalafil Impurity | 171596-42-2 | Tadalafil

,

(1S, 3R) Methyl ester Tadalafil Impurity
In Stock

CAS No.

: 171596-42-2

Mol F.

: C20H18N2O4

Mol W.

: 350.37

Cat No.

: SA20902

(1S, 3R) Open Ring Tadalafil Impurity | 629652-40-0 | Tadalafil

,

(1S, 3R) Open Ring Tadalafil Impurity
In Stock

CAS No.

: 629652-40-0

Mol F.

: C₂₂H₁₉ClN₂O₅

Mol W.

: 426.85

Cat No.

: SA20905

(1S,3R,4R)-ethyl 3-azido-4- hydroxycyclohexanecarboxylate | 365997-32-6 | Edoxaban

,

(1S,3R,4R)-ethyl 3-azido-4- hydroxycyclohexanecarboxylate
In Stock

CAS No.

: 365997-32-6

Mol F.

: C9H15N3O3

Mol W.

: 213.23

Cat No.

: SA33028

(1S,3R,4S)-4-azido-3-(tertbutoxycarbonylamino) cyclohexane carboxylic acid | 365997-67-7 | Edoxaban

(1S,3R,4S)-4-azido-3-(tertbutoxycarbonylamino) cyclohexane carboxylic acid
In Stock

CAS No.

: 365997-67-7

Mol F.

: C12H20N4O4

Mol W.

: 284.31

Cat No.

: SA33027

(2-(Methylamino)pyridin-3- yl)methanol | 32399-12-5 | Isavuconazole

(2-(Methylamino)pyridin-3- yl)methanol
In Stock

CAS No.

: 32399-12-5

Mol F.

: C7H10N2O

Mol W.

: 138.17

Cat No.

: SA44106

(2-Chloro-5-iodophenyl)(4-fluorophenyl)methanone | 915095-86-2 | Empagliflozin

,

(2-Chloro-5-iodophenyl)(4-fluorophenyl)methanone
In Stock

CAS No.

: 915095-86-2

Mol F.

: C13H7ClFIO

Mol W.

: 360.55

Cat No.

: SA15116

(2-Chloro-5-iodophenyl)[4-[[(3S)-tetrahydro-3-furanyl]oxy]phenyl]methanone | 915095-87-3 | Empagliflozin

,

(2-Chloro-5-iodophenyl)[4-[[(3S)-tetrahydro-3-furanyl]oxy]phenyl]methanone
In Stock

CAS No.

: 915095-87-3

Mol F.

: C17H14ClIO3

Mol W.

: 428.65

Cat No.

: SA15117

(2R,3R)-2-(2,4-difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butane-2,3-diol | 133775-25-4 | Efinaconazole

,

(2R,3R)-2-(2,4-difluorophenyl)-1-(1H-1,2,4-triazol-1-yl)butane-2,3-diol
In Stock

CAS No.

: 133775-25-4

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA23615

(2R,3R)-3-(2,5-difluorophenyl)- 3-hydroxy-2-methyl-4-(1H- 1,2,4-triazol-1-yl)butanamide | 241479-75-4 | Isavuconazole

(2R,3R)-3-(2,5-difluorophenyl)- 3-hydroxy-2-methyl-4-(1H- 1,2,4-triazol-1-yl)butanamide
In Stock

CAS No.

: 241479-75-4

Mol F.

: C13H14F2N4O2

Mol W.

: 296.27

Cat No.

: SA44122

(2R,3R)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanenitrile | 2001052-01-1 | Isavuconazole

(2R,3R)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanenitrile
In Stock

CAS No.

: 2001052-01-1

Mol F.

: C13H12F2N4O

Mol W.

: 278.26

Cat No.

: SA44102

(2R,3R)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanethioamide | 368421-58-3 | Isavuconazole

,

(2R,3R)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanethioamide
In Stock

CAS No.

: 368421-58-3

Mol F.

: C13H14F2N4OS

Mol W.

: 312.34

Cat No.

: SA44112

(2R,3R)-Isavuconazole Diol | 241479-72-1 | Isavuconazole

(2R,3R)-Isavuconazole Diol
In Stock

CAS No.

: 241479-72-1

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA44131

(2R,3S) N-Boc Isavuconazonium Impurity | 2169911-50-4 | Isavuconazole

(2R,3S) N-Boc Isavuconazonium Impurity
In Stock

CAS No.

: 2169911-50-4

Mol F.

: C40H43F2N8O7S

Mol W.

: 817.88

Cat No.

: SA44105

(2R,3S)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanenitrile | 2069200-13-9 | Isavuconazole

(2R,3S)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanenitrile
In Stock

CAS No.

: 2069200-13-9

Mol F.

: C13H12F2N4O

Mol W.

: 278.26

Cat No.

: SA44101

(2R,3S)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanethioamide | 170863-34-0 | Isavuconazole

(2R,3S)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanethioamide
In Stock

CAS No.

: 170863-34-0

Mol F.

: C13H14F2N4OS

Mol W.

: 312.34

Cat No.

: SA44114

(2R,3S)-Efinaconazole Diol | Efinaconazole

,

(2R,3S)-Efinaconazole Diol
In Stock

CAS No.

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA23622

(2R,3S)-Isavuconazole Diol | Isavuconazole

(2R,3S)-Isavuconazole Diol
In Stock

CAS No.

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA44132

(2R,5R) Emtricitabine Menthyl Ester | 1773498-61-5 | Emtricitabine

(2R,5R) Emtricitabine Menthyl Ester
In Stock

CAS No.

: 1773498-61-5

Mol F.

: C18H26FN3O4S

Mol W.

: 399.48

Cat No.

: SA22918

(2R,5R)-((1R,2S,5R)-2-isopropyl-5-methylcyclohexyl) 5-(4-benzamido-5-fluoro-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate | NA | Emtricitabine

,

(2R,5R)-((1R,2S,5R)-2-isopropyl-5-methylcyclohexyl) 5-(4-benzamido-5-fluoro-2-oxopyrimidin-1(2H)-yl)-1,3-oxathiolane-2-carboxylate
In Stock

CAS No.

: NA

Mol F.

: C25H30FN3O5S

Mol W.

: 503.59

Cat No.

: SA22927

(2R,5S) Emtricitabine Carboxylic Acid | 1238210-10-0 | Emtricitabine

,

(2R,5S) Emtricitabine Carboxylic Acid
In Stock

CAS No.

: 1238210-10-0

Mol F.

: C8H8FN3O4S

Mol W.

: 261.23

Cat No.

: SA22914

(2R)-1-(2,4-Difluorophenyl)-2-((tetrahydro-2H-pyran-2-yl)oxy)propan-1-one | 126918-17-0 | Efinaconazole

,

(2R)-1-(2,4-Difluorophenyl)-2-((tetrahydro-2H-pyran-2-yl)oxy)propan-1-one
In Stock

CAS No.

: 126918-17-0

Mol F.

: C14H16F2O3

Mol W.

: 270.27

Cat No.

: SA23614

(2S-trans)-Diltiazem | 103532-26-9; 111188-70-6 | Diltiazem

(2S-trans)-Diltiazem
In Stock

CAS No.

: 103532-26-9; 111188-70-6

Mol F.

: C22H26N2O4S

Mol W.

: 414.52

Cat No.

: SA19511

(2S,3R) Efinaconazole Epoxide | 135270-07-4 | Efinaconazole

,

(2S,3R) Efinaconazole Epoxide
In Stock

CAS No.

: 135270-07-4

Mol F.

: C12H11F2N3O

Mol W.

: 251.24

Cat No.

: SA23624

(2S,3R)-3-(2-fluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanenitrile | Isavuconazole

(2S,3R)-3-(2-fluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanenitrile
In Stock

CAS No.

Mol F.

: C13H13FN4O

Mol W.

: 260.27

Cat No.

: SA44128

(2S,3R)-3-(2,4-difluorophenyl)- 3-hydroxy-2-methyl-4-(1H- 1,2,4-triazol-1-yl)butanenitrile | Efinaconazole

,

(2S,3R)-3-(2,4-difluorophenyl)- 3-hydroxy-2-methyl-4-(1H- 1,2,4-triazol-1-yl)butanenitrile
In Stock

CAS No.

Mol F.

: C13H12F2N4O

Mol W.

: 278.26

Cat No.

: SA23621

(2S,3R)-3-(2,5-difluorophenyl)-3- hydroxy-2-methyl-4-(1H-1,2,4-triazol-1- yl)butanenitrile | 241479-74-3 | Efinaconazole

,

(2S,3R)-3-(2,5-difluorophenyl)-3- hydroxy-2-methyl-4-(1H-1,2,4-triazol-1- yl)butanenitrile
In Stock

CAS No.

: 241479-74-3

Mol F.

: C13H12F2N4O

Mol W.

: 278.26

Cat No.

: SA23616

(2S,3R)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanethioamide | 2170932-49-5 | Isavuconazole

(2S,3R)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanethioamide
In Stock

CAS No.

: 2170932-49-5

Mol F.

: C13H14F2N4OS

Mol W.

: 312.34

Cat No.

: SA44111

(2S,3R)-3-hydroxy-2-methyl-3- phenyl-4-(1H-1,2,4-triazol-1- yl)butanenitrile | 241479-74-3 | Isavuconazole

(2S,3R)-3-hydroxy-2-methyl-3- phenyl-4-(1H-1,2,4-triazol-1- yl)butanenitrile
In Stock

CAS No.

: 241479-74-3

Mol F.

: C13H14N4O

Mol W.

: 242.28

Cat No.

: SA44123

(2S,3R)-4-cyclopentyl-3-hydroxy-2-methyl-3-phenylbutanenitrile | Isavuconazole

(2S,3R)-4-cyclopentyl-3-hydroxy-2-methyl-3-phenylbutanenitrile
In Stock

CAS No.

Mol F.

: C16H21NO

Mol W.

: 243.34

Cat No.

: SA44121

(2S,3R)-Efinaconazole Diol | Efinaconazole

,

(2S,3R)-Efinaconazole Diol
In Stock

CAS No.

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA23620

(2S,3S) N-Boc Isavuconazonium Impurity | Isavuconazole

(2S,3S) N-Boc Isavuconazonium Impurity
In Stock

CAS No.

Mol F.

: C40H43F2N8O7S+

Mol W.

: 817.88

Cat No.

: SA44136

(2S,3S)-2-(2,5-difluorophenyl)-1-(1H- 1,2,4-triazol-1-yl)butane-2,3-diol | NA | Efinaconazole

,

(2S,3S)-2-(2,5-difluorophenyl)-1-(1H- 1,2,4-triazol-1-yl)butane-2,3-diol
In Stock

CAS No.

: NA

Mol F.

: C12H13F2N3O2

Mol W.

: 269.25

Cat No.

: SA23617

(2S,3S)-3-(2,5-Difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol -1-yl)butanenitrile | 2001051-99-4 | Isavuconazole

(2S,3S)-3-(2,5-Difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol -1-yl)butanenitrile
In Stock

CAS No.

: 2001051-99-4

Mol F.

: C13H12F2N4O

Mol W.

: 278.26

Cat No.

: SA44103

(2S,3S)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanethioamide | Isavuconazole

(2S,3S)-3-(2,5-difluorophenyl)-3-hydroxy-2-methyl-4-(1H-1,2,4-triazol-1-yl)butanethioamide
In Stock

CAS No.

Mol F.

: C13H14F2N4OS

Mol W.

: 312.34

Cat No.

: SA44113

(2S,3S)-Isavuconazole; Isavuconazole enantiomer | Isavuconazole

(2S,3S)-Isavuconazole; Isavuconazole enantiomer
In Stock

CAS No.

Mol F.

: C22H17F2N5OS

Mol W.

: 437.5

Cat No.

: SA44110

Registration

Register to add the product to RFQ list

Already have an account?