Table 1. Hydrogen-bond geometry (, ).

DHA	DH	HA	D A	DHA
N2H2NO1S	0.884(18)	2.025(18)	2.9030(16)	172.0(16)
O1SH1SOS	0.83(3)	2.76(3)	3.5134(12)	152(2)
O1SH1SON1	0.83(3)	2.49(2)	3.1116(16)	132(2)
C7H7BO1S i	0.98	2.55	3.5181(18)	168

Symmetry code: (i) .