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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N1—H1N⋯O4	0.84 (2)	2.03 (3)	2.865 (13)	170 (2)
N2—H2N⋯O3′i	0.81 (2)	2.00 (3)	2.797 (13)	171 (2)
C2—H2⋯O1i	0.95	2.50	3.423 (2)	163
C6—H6⋯O2ii	0.95	2.49	3.426 (2)	169
C14—H14⋯O4iii	0.95	2.55	3.48 (2)	167

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