InChI=1/C15H14N2O4/c1-11(12-5-3-2-4-6-12)16-14(18)9-7-13-8-10-15(21-13)17(19)20/h2-11H,1H3,(H,16,18)/b9-7+/t11-/m0/s1/f/h16H 41E7464EFC5145CA