InChI=1S/C18H17NO6S/c1-18(10-20)7-6-13-16-14(12-4-2-3-5-15(12)19-16)8-11(17(13)25-18)9-24-26(21,22)23/h2-8,19-20H,9-10H2,1H3,(H,21,22,23)