InChI=1S/C17H17NO6S/c1-23-17-12(19)8-9-6-7-18-15-13(9)14(17)10-4-2-3-5-11(10)16(15)24-25(20,21)22/h2-5,8,15-16,18-19H,6-7H2,1H3,(H,20,21,22)