InChI=1S/C20H28O7S/c1-6-14-17(21)9-16-13(5)18(10-15(11(2)3)19(14)16)27-20(22)12(4)7-8-26-28(23,24)25/h6-7,11,15-16,18-19H,5,8-10H2,1-4H3,(H,23,24,25)/b12-7-,14-6+