5-(2-Thienyl)-4-oxazolecarboxylic acid

5-(2-噻吩基)-4-噁唑羧酸

Also known as: 4-Oxazolecarboxylic acid, 5-(2-thienyl)-, 5-(Thiophen-2-yl)oxazole-4-carboxylic acid, 5-thiophen-2-yl-1,3-oxazole-4-carboxylic acid, 5-thiophen-2-yl-4-oxazolecarboxylic acid, 5-(Thien-2-yl)-1,3-oxazole-4-carboxylic acid

5-(2-Thienyl)-4-oxazolecarboxylic acid (CAS 143659-15-8) is a compound in the Pharma Intermediates category listed in the Jingsj chemical database. It has the molecular formula C8H5NO3S and a molecular weight of 195.19500 g/mol. It is also known as 4-Oxazolecarboxylic acid, 5-(2-thienyl)-, 5-(Thiophen-2-yl)oxazole-4-carboxylic acid and 5-thiophen-2-yl-1,3-oxazole-4-carboxylic acid. Key properties include a boiling point of 357.1ºC at 760 mmHg, a density of 1.47g/cm3 and a flash point of 169.8ºC. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 143659-15-8
Jingsj CID: J-1016879-2
Molecular Formula: C₈H₅NO₃S
Chinese Name: 5-(2-噻吩基)-4-噁唑羧酸
Molecular Weight: 195.19500 g/mol
Category: Pharma Intermediates
Last updated: 8/21/2026

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Physicochemical Properties

Boiling Point	357.1ºC at 760 mmHg
Density	1.47g/cm3
Flash Point	169.8ºC

Frequently Asked Questions

What is the CAS number of 5-(2-Thienyl)-4-oxazolecarboxylic acid?

The CAS number of 5-(2-Thienyl)-4-oxazolecarboxylic acid is 143659-15-8.

What are the molecular formula and molecular weight of 5-(2-Thienyl)-4-oxazolecarboxylic acid?

5-(2-Thienyl)-4-oxazolecarboxylic acid has molecular formula C8H5NO3S and molecular weight 195.19500 g/mol.

Data compiled from public chemical databases and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "5-(2-Thienyl)-4-oxazolecarboxylic acid (CAS 143659-15-8)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1016879-2 (accessed 2026-10-23).

Data for reference only; verify specifications, grades and regulatory status with suppliers before purchase.