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