InChI=1/C16H28N4O2/c1-4-8-18-14(21)10-20(9-5-2)11-15(22)19-16(3,12-17)13-6-7-13/h13H,4-11H2,1-3H3,(H,18,21)(H,19,22)/t16-/m0/s1/f/h18-19H 4188FC372DC9BF8A