InChI=1S/C28H40O4/c1-19(12-8-14-21(3)27(30)31)10-7-11-20(2)13-9-16-28(6)17-15-24-18-25(29)22(4)23(5)26(24)32-28/h10,13-14,18,29H,7-9,11-12,15-17H2,1-6H3,(H,30,31)/b19-10+,20-13+,21-14+/t28-/m1/s1