InChI=1S/C19H22O7S/c20-16-9-6-14(7-10-16)8-11-17(21)13-18(22)19(26-27(23,24)25)12-15-4-2-1-3-5-15/h1-7,9-10,17,19-21H,8,11-13H2,(H,23,24,25)