InChI=1S/C19H21NO6S/c1-20-15-10-12-6-4-5-7-14(12)18-17(15)13(8-9-26-27(21,22)23)11-16(24-2)19(18)25-3/h4-7,10-11,20H,8-9H2,1-3H3,(H,21,22,23)