InChI=1S/C18H17NO6S/c1-18(2)17-16(24-17)13-14-11(10-5-3-4-6-12(10)19-14)7-9(15(13)25-18)8-23-26(20,21)22/h3-7,16-17,19H,8H2,1-2H3,(H,20,21,22)