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

Cg1 and Cg2 are the centroids of the pyrazine and pyridine rings N1/C1/C2/N1′/C1′/C2′ and N2/C3–C7, respectively [symmetry code (′): −x + 2, −y + , z].

D—H⋯A	D—H	H⋯A	D⋯A	D—H⋯A
C7—H7⋯O1i	0.94	2.48	3.308 (3)	147
C4—H4⋯Cg2ii	0.94	2.92	3.739 (2)	147
C10—H10B⋯Cg1iii	0.97	2.56	3.409 (3)	146
C10—H10B⋯Cg1iv	0.97	2.56	3.409 (3)	146

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