SMILES: C1=CC=C2C(=C1)C(=C(S2)/C=C\\C(=O)C(=O)O)[O-]
Description: The molecule is a 4-(3-hydroxy-1-benzothiophen-2-yl)-2-oxobut-3-enoate in which the acyclic double bond has Z-geometry. It is a conjugate base of a cis-4-(3-hydroxy-1-benzothiophen-2-yl)-2-oxobut-3-enoic acid.