ChEBI: Hydroxy(phenyl)2-thienylacetic acid is a 2-hydroxy monocarboxylic acid that is phenylacetic acid bearing hydroxy and 2-thenyl substituents at position 2. It has a role as a hapten. It is a member of thiophenes and a 2-hydroxy monocarboxylic acid. It is functionally related to an acetic acid.