InChI=1S/C18H20N2O2S/c1-13-12-14(18(21)22)6-7-16(13)23-17-5-3-2-4-15(17)20-10-8-19-9-11-20/h2-7,12,19H,8-11H2,1H3,(H,21,22)/p+1