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Clearsynth is a leading innovator in pharmaceutical reference standards, offering high-quality Reference Standards for Benzofuran, including both pharmacopeial and non-pharmacopeial impurities, metabolites, stable isotope products, and nitrosamines (N-NO products). Our Benzofuran impurity reference standards are invaluable for pharmaceutical research, supporting product development, ANDA and DMF submissions, quality control (QC), method validation, and stability studies. They also aid in identifying unknown impurities and assessing genotoxic potential.
Our Benzofuran-related products undergo thorough characterization and are supplied with detailed Certificates of Analysis (COA) and analytical data that meet regulatory requirements. All supplied products are re-tested at regular intervals to ensure ongoing quality and compliance.

Benzofuran Related Compounds

Stable Isotopes

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(3aS,8aR)-6-(Methoxy-d3)-4-(methoxymethoxy)-2,3,3a,8a-tetrah... Stable Isotopes CS-T-102415 Not Available Enquire
(E)-6-(1,3-Dihydro-4,6-dimethoxy-7-methyl-3-oxo-5-isobenzofu... Stable Isotopes CS-T-101081 Not Available Enquire
1,2,3,4,7,8,9-Heptachlorodibenzofuran-13C12 Stable Isotopes CS-O-58534 109719-94-0 Enquire
1,2,3,4,7,8-Hexachlorodibenzofuran-13C12 Stable Isotopes CS-O-58533 114423-98-2 Enquire
2-(Benzofuran-2-yl)-2-imidazoline-d4 Hydrochloride Stable Isotopes CS-T-101863 Not Available Enquire
2,3,4,7,8-Pentachlorodibenzofuran-13C12 Stable Isotopes CS-O-58531 116843-02-8 Enquire
2,3,7,8-Tetrachlorodibenzofuran-13C12 Stable Isotopes CS-EO-02427 89059-46-1 Enquire
2-Ethyl-2,3-dihydro-5-acetylbenzofuran-d3 Stable Isotopes CS-T-101409 Not Available Enquire
3-(tert-Butyl-d9)-5-[7-(hydroxyethyl)-2-benzofuranyl]-2-oxaz... Stable Isotopes CS-T-101750 1189998-94-4 Enquire
4,6-Dihydroxy-2-[(3-hydroxy-4-methoxyphenyl)methylene]-3(2H)... Stable Isotopes CS-T-102706 2734189-91-2 Enquire
5-(1-Piperazinyl)-2-benzofurancarboxylic Acid Ethyl Ester-d4... Stable Isotopes CS-T-102118 Not Available Enquire
5-(1-Piperazinyl)benzofuran-2-carboxylic Acid-d8 Stable Isotopes CS-T-102119 Not Available Enquire
5-(4-Nitrosopiperazin-1-yl)benzofuran-2-carboxylic Acid Ethy... Stable Isotopes CS-T-102178 Not Available Enquire
8-Chloro-1-phenyldibenzofuran-d11 Stable Isotopes CS-O-54183 809274-52-0 (Unlabelled) Enquire
Dronedarone-d5 (Benzofuranyl-4,6,7-d3 and 2-Butyl-1,1-d2) Stable Isotopes CS-O-56752 141626-36-0 (Unlabelled) In Stock
Hexahydro-1,3-isobenzofurandione-d8 Stable Isotopes CS-T-102836 85-42-7(Unlabelled) Enquire
rac-3-(tert-Butyl-d9)-5-(7-ethyl-2-benzofuranyl)-2-oxazolidi... Stable Isotopes CS-T-101755 1189870-01-6 Enquire


Impurity

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(2-butylbenzofuran-3-yl)(3,5-diiodo-4-methoxyphenyl)methanon... Impurity CS-O-54204 149702-94-3 Enquire
(2-butylbenzofuran-3-yl)(4-ethoxy-3,5-diiodophenyl)methanone Impurity CS-O-54197 290295-98-6 Enquire
(2-butylbenzofuran-6-yl)(4-methoxyphenyl)methanone Impurity CS-O-54199 171860-06-3 Enquire
(2R)-2-[[3-(2-Benzofuranyl)imidazo[1,2-b]pyridazin-6-yl]oxy]... Impurity CS-O-54370 1426928-20-2 Enquire
(4-(2-(diethylamino)ethoxy)-3,5-diiodophenyl)(2-(1-hydroxybu... Impurity CS-O-44594 1548369-35-2 Enquire
1-(3-(4-(2-(diethylamino)ethoxy)-3,5-diiodobenzoyl)benzofura... Impurity CS-O-44593 2231394-66-2 Enquire
1-(6-methoxy-2-methyl-2,3-dihydrobenzofuran-3-yl)ethanone Impurity CS-O-54448 ---- Enquire
2-butyl benzofuran Impurity CS-O-10741 4265-27-4 Enquire
4-(2-butylbenzofuran-3-carbonyl)-2-iodophenyl 2-(diethylamin... Impurity CS-O-54198 ---- Enquire
4-Acetamido-5-chloro-2,3-dihydrobenzofuran-7-carboxylic acid Impurity CS-O-43156 338791-13-2 Enquire
4-Amino-5-Bromo-2,3-dihydrobenzofuran-7-Carboxylic Acid Impurity CS-O-43155 Not Available Enquire
6-methoxy-2-methylbenzofuran-3-carboxylic acid Impurity CS-O-54447 103986-33-0 Enquire
Darifenacin Vinylbenzofuran Impurity Impurity CS-O-15720 633335-98-5 In Stock
Ethyl-4-amino-5-chloro-2, 3-dihydrobenzofuran-7-carboxylate Impurity CS-O-54016 ---- Enquire
Isopropyl-4-amino-5-chloro-2,3-dihydrobenzofuran-7-carboxyla... Impurity CS-O-54017 ---- Enquire
Olaparib (E) isobenzofuran-1(3H)-one Impurity CS-O-50127 2905341-98-0 Enquire
Olaparib isobenzofuran-1(3H)-one impurity Impurity CS-O-47106 1830366-25-0 Enquire
(3aS,7aS)-octahydroisobenzofuran Impurity CS-O-36206 10479-79-5 Enquire
(3-Bromo-4-hydroxyphenyl)(2-ethyl-3-benzofuranyl)-methanone Impurity CS-T-49784 94729-09-6 Enquire
(3S)-6-(trifluoromethyl)-2,3-dihydro-1-benzofuran-3-amine Impurity CS-O-37793 1272724-36-3 Enquire
(6-Bromo-2-ethyl-3-benzofuranyl)(3,5-dibromo-4-hydroxyphenyl... Impurity CS-T-49785 1402819-05-9 Enquire
(N-((S)-3(2-amino-2oxo-1,1diphenylethyl)pyrrolidin-1-yl)-2-(... Impurity CS-O-31174 Not Available Enquire
(R)-1-(benzofuran-3-yl)propan-2-amine Impurity CS-O-39306 1336205-35-6 Enquire
(S)-2-(2-(benzofuran-6-carbonyl )-5,7-dichloro-1,2,3,4-tetra... Impurity CS-O-38472 Not Available Enquire
(S)-2-(2-(benzofuran-6-carbonyl)-5,7-dichloro-1,2-dihydroiso... Impurity CS-O-38470 Not Available Enquire
1-((5-cyano-2-(4-fluorobenzoyl)benzyl)oxy)-1-(4-fluorophenyl... Impurity CS-O-37688 Not Available Enquire
1-{5-Cyano-2-[(4-dimethylamino)-1-(4-Fluoro-phenyl)-1-hydrox... Impurity CS-O-37689 Not Available Enquire
2,3,7,8-Tetrachlorodibenzofuran Impurity CS-T-61748 51207-31-9 Enquire
2,4,8-Trichlorodibenzofuran Impurity CS-T-94143 54589-71-8 Enquire
2,8-Dichlorodibenzofuran Impurity CS-T-94142 5409-83-6 Enquire
3-(6,7-Dibromo-2,3-dihydrobenzofuran-5-yl)propanoic Acid Impurity CS-T-52514 196597-76-9 Enquire
3,3,4,6-tetrabromoisobenzofuran-1(3H)-one Impurity CS-BL-00156 ---- Enquire
3,3,6-tribromoisobenzofuran-1(3H)-one Impurity CS-BL-00155 ---- Enquire
3,3-dibromoisobenzofuran-1(3H)-one Impurity CS-BL-00152 169141-21-3 Enquire
3,4,6-tribromoisobenzofuran-1(3H)-one Impurity CS-BL-00154 ---- Enquire
3,6-dibromoisobenzofuran-1(3H)-one Impurity CS-BL-00153 40125-50-6 Enquire
4,5-difluoro-3-(phenylthio)isobenzofuran-1(3H)-one Impurity CS-O-37786 2136287-64-2 Enquire
4,5-difluoro-3-hydroxyisobenzofuran-1(3H)-one Impurity CS-O-37852 2136287-63-1 Enquire
4-amino-5-chloro-N-(1-(3-methoxypropyl)piperidin-4-yl)benzof... Impurity CS-O-38979 Not Available Enquire
6-(trifluoromethyl)-2,3-dihydrobenzofuran-3-amine Impurity CS-O-37799 1273665-89-6 Enquire
Benzofuran-5-yl-Acetic Acid Impurity CS-P-07254 142935-60-2 Enquire
Hexahydro-3a,7a-dimethyl-4,7-epoxyisobenzofuran-1,3-dione Impurity CS-ED-02065 80558-50-5 Enquire
N-(1H-benzo[d]imidazol-2-yl)-2-(6-methylbenzofuran-3-yl)acet... Impurity CS-O-38786 749893-13-8 Enquire


Intermediate

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
(2-Butyl-5-nitrobenzofuran-3-yl) (4-hydroxy phenyl) methanon... Intermediate CS-O-31692 141645-16-1 In Stock
1-(2,3-dihydrobenzofuran-5-yl) ethanone Intermediate CS-O-15572 90843-31-5 In Stock
1-(4-fluorophenyl)-1,3-dihydro isobenzofuran-5-carbonitrile Intermediate CS-O-31216 64169-67-1 In Stock
1,3-Dihydroisobenzofuran-5-ylamine Intermediate CS-O-49526 61964-08-7 Enquire
1-Benzofuran-5-Amine Intermediate CS-AC-03392 58546-89-7 In Stock
1-benzofuran-6-carboxylic acid Intermediate CS-O-16513 77095-51-3 In Stock
2-(2-(butyl-1,1-d2)benzofuran-5-yl-3,4,6,7-d4)isoindoline-1,... Intermediate CS-O-57763 --- In Stock
2-(2-butylbenzofuran-5-yl)isoindoline-1,3-dione Intermediate CS-O-57767 ---- In Stock
2-(butyl-1,1-d2)benzofuran-3,4,6,7-d4-5-amine Intermediate CS-O-57768 ---- In Stock
2-butylbenzofuran-5-amine Intermediate CS-ED-42349 141645-51-4 In Stock
4-amino-5-chlor-2,3-dihydro-7-benzofurancarboxylic acid Intermediate CS-O-32073 123654-26-2 In Stock
5-(2-bromoethyl)Benzofuran Intermediate CS-O-15714 133034-06-7 In Stock
Ethyl 5-amino-1-benzofuran-2-carboxylate Intermediate CS-T-22486 174775-48-5 In Stock


Fine Chemicals

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
2-Butyl-3-[4-(4-hydroxybenzoyloxy)benzoyl]-5-nitrobenzofuran Fine Chemicals CS-O-53800 ---- Enquire
3,5-Dibromoisobenzofuran-1(3H)-one Fine Chemicals CS-O-59765 102126-70-5 Enquire
3-acetyl-6-methoxybenzofuran-2(3H)-one Fine Chemicals CS-O-54449 ---- Enquire
3-Hydroxyisobenzofuran-1(3H)-one Fine Chemicals CS-O-54374 16859-59-9 Enquire
6-Hydroxy-2-methylbenzofuran-3-carboxylic acid Fine Chemicals CS-O-59566 854515-52-9 In Stock
6-methoxybenzofuran-2(3H)-one Fine Chemicals CS-O-54450 98879-99-3 Enquire
Methyl 6-methoxy-2-methylbenzofuran-3-carboxylate Fine Chemicals CS-O-54451 1823289-41-3 Enquire
(2-Ethyl-3-benzofuranyl)(4-methoxyphenyl)methanone Fine Chemicals CS-O-36551 3343-80-4 Enquire
[3-[1-(2-aminoethyl)indazol-3-yl]pyrrolidin-1-yl]-[(2S)-2-me... Fine Chemicals CS-O-36085 1381541-88-3 Enquire
[3-[1-(2-aminoethyl)pyrazolo[3,4-b]pyridin-3-yl]pyrrolidin-1... Fine Chemicals CS-O-36088 1381488-88-3 Enquire
2-Benzofurancarboxylic acid, 5-(1-piperazinyl)-, ethyl ester... Fine Chemicals CS-ZE-30694 1422956-31-7 Enquire
4-bromobenzofuran-3-carboxylic acid Fine Chemicals CS-O-39032 1823891-85-5 Enquire
5-(trifluoromethyl)benzofuran-2-carboxylic acid Fine Chemicals CS-O-37933 531524-04-6 Enquire
5-bromo-2-methyl-2,3-dihydrobenzofuran-3-carboxylic acid Fine Chemicals CS-O-38188 1781798-23-9 Enquire
5-hydroxy-2,3-dihydrobenzofuran-3-carboxylic acid Fine Chemicals CS-O-38185 1554661-46-9 Enquire
5-methoxy-2,3-dihydrobenzofuran-4-carbaldehyde Fine Chemicals CS-O-38202 156297-81-3 Enquire
6-bromo-2,3-dihydrobenzofuran-3-carboxylic acid Fine Chemicals CS-O-38186 1500380-74-4 Enquire
6-bromo-2-methyl-2,3-dihydrobenzofuran-3-carboxylic acid Fine Chemicals CS-O-38187 1784106-43-9 Enquire
6-hydroxy-2,3-dihydrobenzofuran-3-carboxylic acid Fine Chemicals CS-O-38184 1554436-82-6 Enquire


Nitrosamine

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
3-(4-nitrosopiperazin-1-yl)benzofuran-2-carboxamide Nitrosamine CS-O-49385 Not Available Enquire


Stable Isotope Reagent

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
7-Methylbenzofuran-d6 Stable Isotope Reagent CS-T-104007 17059-52-8(unlabelled) Enquire
Dibenzofuran-d8 Stable Isotope Reagent CS-C-01460 93952-04-6 In Stock


Building Blocks

COMPOUND CATEGORY CAT. No. CAS. No. STOCK STATUS
1,3-Dihydroisobenzofuran-4-ol Building Blocks CS-O-46131 417704-22-4 Enquire
2-((prop-2-yn-1-yloxy)methyl)-2,3-dihydrobenzofuran-4-carbal... Building Blocks CS-O-47939 Not Available Enquire
2,3-Dihydrobenzofuran Building Blocks CS-O-30846 496-16-2 In Stock
7-Bromo-2,3-dihydro-5-benzofuranamine Building Blocks CS-O-48621 191602-53-6 Enquire
5-(1-Piperazinyl)-2-benzofurancarboxylic Acid Methyl Ester Building Blocks CS-TA-36290 1186225-86-4 Enquire