InChI=1S/C23H23NO7S/c1-14(25)29-13-12-24-19-6-4-5-7-20(19)32-22(21(23(24)28)31-16(3)27)17-8-10-18(11-9-17)30-15(2)26/h4-11,21-22H,12-13H2,1-3H3/t21-,22+/m1/s1