InChI=1S/C15H16N2O5/c18-12(15(21)22)6-10-13-8(5-11(16-10)14(19)20)7-3-1-2-4-9(7)17-13/h1-4,10-12,16-18H,5-6H2,(H,19,20)(H,21,22)