InChI=1/C18H18N2O3/c1-11-4-7-13(8-5-11)19-16(21)18(3)17(22)20-14-10-12(2)6-9-15(14)23-18/h4-10H,1-3H3,(H,19,21)(H,20,22)/t18-/m1/s1/f/h19-20H 63BF799DF891892C