InChI=1S/C17H22O7S/c1-25-9-11(7-10-5-3-2-4-6-10)8-23-17-14(20)12(18)13(19)15(24-17)16(21)22/h2-7,12-15,17-20H,8-9H2,1H3,(H,21,22)/b11-7+