IUPAC: 7,8,9-trihydroxy-3,5-dioxo-1H,2H,3H,5H-cyclopenta[c]isochromene-1-carboxylic acid

SMILES: OC(=O)C1CC(=O)c2oc(=O)c3cc(O)c(O)c(O)c3c12