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