InChI=1S/C15H14N2O3/c1-8(18)13-14(19)12(17-15(13)20)6-9-7-16-11-5-3-2-4-10(9)11/h2-5,7,12,16,18H,6H2,1H3,(H,17,20)/p-1/b13-8-/t12-/m0/s1