Table 2. Hydrogen-bond geometry (Å, °) for (3b) .

Cg1 is the centroid of the S1/C1–C5 thio­phene ring.

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
N9—H9⋯O8i	0.86	2.08	2.935 (3)	179
C6—H6A⋯N10	0.97	2.44	2.782 (3)	100
C13—H13⋯Cg1ii	0.93	2.68	3.611 (2)	179

Symmetry codes: (i) ; (ii) .