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

Cg is the centroid of the pyridine ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N2—H21⋯O2i	0.85 (2)	2.100 (19)	2.8675 (16)	150 (2)
N2—H22⋯O4ii	0.88 (2)	2.00 (2)	2.8685 (17)	169 (2)
O5—H51⋯O4iii	0.81 (2)	2.11 (2)	2.8930 (15)	162 (2)
O5—H52⋯O2iv	0.87 (3)	1.91 (3)	2.7542 (15)	163 (2)
C4—H4⋯O2iii	0.93	2.46	3.3824 (18)	175
C13—H13⋯O3v	0.93	2.49	3.290 (2)	144
C6—H6⋯Cg vi	0.93	2.75	3.656 (2)	166

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