InChI=1S/C26H38O4/c1-17(9-7-10-18(2)12-13-23(27)28)11-8-15-26(6)16-14-22-21(5)24(29)19(3)20(4)25(22)30-26/h10-11,29H,7-9,12-16H2,1-6H3,(H,27,28)/b17-11+,18-10+/t26-/m1/s1