InChI=1S/C29H26O4/c1-31-27-7-3-5-23-14-10-20-11-15-24(16-12-20)32-28-19-22(13-17-26(28)30)9-8-21-4-2-6-25(18-21)33-29(23)27/h2-7,11-13,15-19,30H,8-10,14H2,1H3