4-(3-hydroxy-1-benzothiophen-2-yl)-2-oxobut-3-enoate
4-(3-hydroxy-1-benzothiophen-2-yl)-2-oxobut-3-enoate
A 2-oxo monocarboxylic acid anion resulting from the deprotonation of the carboxy group of a 4-(3-hydroxy-1-benzothiophen-2-yl)-2-oxobut-3-enoic acid.