Table 2. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A	Mulliken overlap	H-bond energy
N6—H37⋯O4	1.043	1.807	2.781	153.7	0.063	5.8
N6—H36⋯Cl38	1.054	2.070	3.094	163.2	0.088
N6—H35⋯Cl38	1.047	2.181	3.159	154.6	0.077
O1—H26⋯Cl38	0.993	2.159	3.146	172.1	0.064	35.6
N5—H23⋯Cl38	1.025	2.545	3.465	149.0	0.036
C16—H28⋯Cl38	1.099	2.485	3.422	142.4	0.032
C11—H22⋯O1	1.090	2.443	2.825	98.9	0.017
C13—H24⋯O3	1.089	2.656	3.592	143.7	0.012
C17—H31⋯O3	1.100	2.642	3.637	150.3	0.010