Table 3. Hydrogen-bond geometry (Å, °) for 1b .

Cg1 is the centroid of the C1–C6 ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N8—H8⋯O10i	0.83 (2)	2.00 (2)	2.8255 (18)	174.2 (19)
C11—H11⋯O10i	1.00	2.48	3.353 (2)	146
C12—H12E⋯Cg1ii	0.98	2.62	3.493 (13)	149

Symmetry codes: (i) ; (ii) .