InChI=1/C16H20N2O3/c1-10-7-8-13-12(9-10)18-15(20)16(2,21-13)14(19)17-11-5-3-4-6-11/h7-9,11H,3-6H2,1-2H3,(H,17,19)(H,18,20)/t16-/m1/s1/f/h17-18H 0107C9F5CF35D0CE