InChI=1S/C20H28O7S/c1-6-11(3)20(22)27-18-9-15(12(4)10-26-28(23,24)25)19-14(7-2)17(21)8-16(19)13(18)5/h6-7,12,15-16,18-19H,5,8-10H2,1-4H3,(H,23,24,25)/b11-6-,14-7+