InChI=1S/C21H28O7S/c1-13(8-7-9-14(2)20(21(22)23)28-29(24,25)26)10-11-18-15(3)12-19(27-6)17(5)16(18)4/h7-12,14,20H,1-6H3,(H,22,23)(H,24,25,26)/b9-7+,11-10+,13-8+