InChI=1S/C19H18O7S/c1-12(26-27(22,23)24)11-15(13-7-3-2-4-8-13)17-18(20)14-9-5-6-10-16(14)25-19(17)21/h2-10,12,15,20H,11H2,1H3,(H,22,23,24)