InChI=1S/C16H23N5O/c1-2-3-4-7-18-16(17)21-20-10-13-9-19-15-6-5-12(11-22)8-14(13)15/h5-6,8-10,20,22H,2-4,7,11H2,1H3,(H3,17,18,21)/b13-10+