InChI=1/C18H20N2O4/c1-22-15-7-3-13(4-8-15)11-17(19)20-24-18(21)12-14-5-9-16(23-2)10-6-14/h3-10H,11-12H2,1-2H3,(H2,19,20)/p+1/fC18H21N2O4/h20H,19H2/q+1 84EA713F04568232