Table 1. Hydrogen-bond geometry (Å, °).

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1A⋯O15i	0.945 (18)	1.833 (19)	2.7739 (17)	173.0 (15)
N1—H1B⋯O15	0.902 (16)	1.895 (17)	2.7836 (15)	167.8 (14)
N1—H1B⋯O14	0.902 (16)	2.632 (16)	3.2580 (16)	127.2 (13)
N1—H1C⋯O14ii	0.925 (18)	1.887 (18)	2.7660 (16)	157.9 (14)
N1′—H1′A⋯O14′	0.882 (19)	1.857 (19)	2.7355 (17)	174.2 (15)
N1′—H1′B⋯O14′iii	0.897 (17)	1.908 (17)	2.7836 (16)	164.8 (15)
N1′—H1′B⋯O15′iii	0.897 (17)	2.533 (16)	3.1858 (16)	130.1 (13)
N1′—H1′C⋯O15′iv	0.916 (18)	1.934 (18)	2.7585 (16)	148.8 (14)

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