InChI=1S/C20H22N2O4S/c1-13(23)26-18-19(14-7-9-15(24)10-8-14)27-17-6-4-3-5-16(17)22(20(18)25)12-11-21-2/h3-10,18-19,21,24H,11-12H2,1-2H3/t18-,19+/m1/s1