IUPAC: 1-{3',6'-dihydroxy-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthen]-5-yl}-5-methylidene-2,5-dihydro-1H-pyrrol-2-one
IUPAC: 1-{3',6'-dihydroxy-3-oxo-3H-spiro[2-benzofuran-1,9'-xanthen]-5-yl}-5-methylidene-2,5-dihydro-1H-pyrrol-2-one
SMILES: Oc1ccc2c(Oc3cc(O)ccc3C22OC(=O)c3cc(ccc23)N2C(=C)C=CC2=O)c1
SMILES: Oc1ccc2c(Oc3cc(O)ccc3C22OC(=O)c3cc(ccc23)N2C(=C)C=CC2=O)c1