InChI=1S/C19H20N2O2/c1-2-10-8-21-17-7-14-13-5-11(23)3-4-16(13)20-19(14)18(21)6-12(10)15(17)9-22/h2-5,8,12,15,17-18,20,22H,6-7,9H2,1H3/p+1/t12-,15-,17+,18+/m1/s1