InChI=1S/C31H38O4/c1-18(2)8-7-9-20(5)11-12-22-15-25-28(16-27(22)32)34-17-26-24-14-21(6)29(33)23(13-10-19(3)4)30(24)35-31(25)26/h8,10-11,14-16,26,31-33H,7,9,12-13,17H2,1-6H3/b20-11+/t26-,31-/m0/s1