InChI=1S/C16H20N2O3/c1-10(2)7-14(16(20)21)18-15(19)8-11-9-17-13-6-4-3-5-12(11)13/h3-6,9-10,14,17H,7-8H2,1-2H3,(H,18,19)(H,20,21)/p-1