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