InChI=1S/C20H22N2O3S/c21-19(12-15-6-2-1-3-7-15)20(23)14-22-26(24,25)18-11-10-16-8-4-5-9-17(16)13-18/h1-11,13,19-20,22-23H,12,14,21H2/t19-,20+/m0/s1