Table 1. Hydrogen-bond geometry (, ).

Cg1 is the centroid of the benzene ring.

DHA	DH	HA	D A	DHA
C9H9AO3A i	0.92(3)	2.53(3)	3.216(6)	131(3)
C4H4Cg1ii	0.93	2.99	3.6957	134
C7H7Cg1iii	0.93	2.99	3.6980	134

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