InChI=1S/C19H23NO7S/c1-20-7-6-13-10-18(26-3)16(21)11-14(13)15(20)8-12-4-5-17(25-2)19(9-12)27-28(22,23)24/h4-5,9-11,15,21H,6-8H2,1-3H3,(H,22,23,24)