InChI=1S/C24H22O3/c1-2-22(18-9-5-3-6-10-18)24(19-11-7-4-8-12-19)20-13-15-21(16-14-20)27-17-23(25)26/h3-16H,2,17H2,1H3,(H,25,26)/b24-22+