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