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

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H21⋯O2i	0.83 (2)	2.10 (2)	2.870 (2)	155 (2)
O4—H41⋯O2ii	0.83 (3)	1.84 (3)	2.6339 (19)	159 (3)
C11—H11⋯Cg1iii	0.93	2.87	3.600 (3)	136

Symmetry codes: (i) ; (ii) ; (iii) . Cg1 is the centroid of the C2–C7 ring.