InChI=1S/C29H28O3/c1-28(2,21-8-14-25(30)15-9-21)20-4-6-22(7-5-20)29(3,23-10-16-26(31)17-11-23)24-12-18-27(32)19-13-24/h4-19,30-32H,1-3H3