Formula: C20H16O5 | Mol. Weight: 336.30 g/mol
IUPAC: (4'aS,5'R,8'S,8'aS)-5',8'-dihydroxyspiro[2,4-dioxatricyclo[7.3.1.05,13]trideca-1(12),5,7,9(13),10-pentaene-3,4'-4a,5,8,8a-tetrahydronaphthalene]-1'-one
C1=CC2=C3C(=C1)OC4(C=CC(=O)C5C4C(C=CC5O)O)OC3=CC=C2