InChI=1S/C21H25NO6S/c1-12-6-7-21(23)16-10-14-4-5-15(28-29(24,25)26)18-17(14)20(21,19(12)27-18)8-9-22(16)11-13-2-3-13/h4-5,13,16,19,23H,1-3,6-11H2,(H,24,25,26)/t16-,19+,20+,21-/m1/s1