InChI=1S/C20H28O7S/c1-11(2)8-19(22)27-18-10-15(12(3)4)20-14(6-7-26-28(23,24)25)17(21)9-16(20)13(18)5/h6,8,12,15-16,18,20H,5,7,9-10H2,1-4H3,(H,23,24,25)/b14-6+