SMILES: C1=CC=C2C(=C1)C(=CC(=O)O2)[O-]
Description: The molecule is an organic anion that is the conjugate base of 4-hydroxycoumarin, obtained by deprotonation of the 4-hydroxy group. It is the major microspecies at pH 7.3 (according to Marvin v 6.2.0.). It is a conjugate base of a 4-hydroxycoumarin.