IUPAC: (2R,2'S,5'R)-5-hydroxy-2'-(3-hydroxyprop-1-en-2-yl)-3-oxo-3H-spiro[1-benzofuran-2,1'-cyclopentane]-5'-carboxylic acid

SMILES: OCC(=C)[C@@H]1CC[C@@H](C(O)=O)[C@]11Oc2ccc(O)cc2C1=O