InChI=1/C16H20N2O3/c19-15(18-20)11-7-2-1-6-10-14-12-17-16(21-14)13-8-4-3-5-9-13/h3-5,8-9,12,20H,1-2,6-7,10-11H2,(H,18,19)/f/h18H 04CE04AE3B78C4A5