InChI=1S/C20H23N3O7S/c1-29-16-7-9-17(10-8-16)31(27,28)23-12-11-22(13-18(23)19(24)21-26)20(25)30-14-15-5-3-2-4-6-15/h2-10,18,26H,11-14H2,1H3,(H,21,24)/t18-/m1/s1