Table 1. Hydrogen-bond geometry (, ).

Cg2 is the centroid of the benzene ring C2C7.

DHA	DH	HA	D A	DHA
N1H1O3i	0.896(16)	2.105(16)	2.8938(13)	146.3(13)
C7H7O1ii	0.984(16)	2.503(16)	3.4264(15)	156.3(12)
C1H1B Cg2i	0.978(16)	2.595(15)	3.4578(12)	147.4(11)

Symmetry codes: (i) ; (ii) .