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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N21—H21A⋯O12ii	0.86	2.03	2.884 (3)	174
N21—H21B⋯O14iii	0.86	2.15	2.946 (3)	154
N22—H22A⋯O11iv	0.86	2.10	2.955 (3)	174
N22—H22B⋯O24v	0.86	2.19	3.044 (4)	172
C22—H22⋯O24v	0.93	2.26	3.154 (4)	160
C11—H11⋯O23i	0.93	2.56	3.047 (4)	113
C12—H12⋯O23i	0.93	2.53	3.054 (4)	116
C51—H51⋯O13	0.93	2.36	2.910 (4)	117
C52—H52⋯O13	0.93	2.57	3.017 (4)	110

Symmetry codes: (i) ; (ii) ; (iii) ; (iv) ; (v) .