InChI=1S/C20H20N2O5S/c1-21-18-10-9-16(12-17(18)19(23)20(21)24)28(25,26)22-11-5-6-14(22)13-27-15-7-3-2-4-8-15/h2-4,7-10,12,14H,5-6,11,13H2,1H3/t14-/m0/s1