Table 1. Hydrogen-bond geometry (, ).

Cg1 is the centroid of the toluene ring C1C6.

DHA	DH	HA	D A	DHA
O3H31O1	0.84(2)	2.13(2)	2.897(2)	152(3)
O3H32O2i	0.86(2)	1.92(2)	2.772(2)	174(3)
N1H1NO3ii	0.84(2)	2.15(2)	2.941(2)	158(2)
N2H2NO1i	0.87(2)	2.09(2)	2.944(2)	165(2)
C14H14O2iii	0.93	2.57	3.404(2)	150
C15H15Cg1iii	0.93	2.89	3.793(2)	165

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