InChI=1S/C27H34O4/c1-19(2)8-6-9-20(3)10-7-11-21(4)12-17-24-25(28)18-26(31-27(24)29)22-13-15-23(30-5)16-14-22/h8,10,12-16,18,28H,6-7,9,11,17H2,1-5H3/b20-10+,21-12+