Table 2. Hydrogen-bond geometry (Å, °) for 4-HO-NPT.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
O1—H1⋯N2	1.01 (1)	1.59 (1)	2.5905 (15)	175 (2)
N1—H1A⋯O1i	0.87 (1)	2.06 (1)	2.9347 (16)	177 (2)
N2—H2⋯O1ii	0.90 (1)	2.62 (1)	3.4957 (17)	166 (2)

Symmetry codes: (i) ; (ii) .