InChI=1/C15H18N2O4/c18-13(16-21)9-3-1-2-6-10-17-14(19)11-7-4-5-8-12(11)15(17)20/h4-5,7-8,21H,1-3,6,9-10H2,(H,16,18)/f/h16H 8306BF8657D876C3