InChI=1S/C16H20N2O3/c1-3-10(2)15(16(20)21)18-14(19)8-11-9-17-13-7-5-4-6-12(11)13/h4-7,9-10,15,17H,3,8H2,1-2H3,(H,18,19)(H,20,21)/p-1