InChI=1S/C20H22N2.2C4H4O4/c1-22-13-10-16(11-14-22)19-18-7-3-2-5-15(18)8-9-17-6-4-12-21-20(17)19;2*5-3(6)1-2-4(7)8/h2-7,12H,8-11,13-14H2,1H3;2*1-2H,(H,5,6)(H,7,8)/b;2*2-1-