Table 3. π–π inter­action (Å, °).

Cg1 is the centroid of the O1/C1/N1/C5/C4 ring and Cg2 is the centroid of the C4–C9 ring. CgI⋯CgJ is the distance between ring centroids. α is the dihedral angle between the planes of the rings I and J. CgI _perp and CgJ _perp are the perpendicular distances of CgI from ring J and of CgJ from ring I, respectively. CgI _Offset and CgJ _Offset are the distances between CgI and the perpendicular projection of CgJ on ring I, and between CgJ and the perpendicular projection of CgI on ring J, respectively.

I	J	CgI⋯CgJ	α	CgI perp	CgJ perp	CgI Offset	CgJ Offset
1	2ii	3.6640 (11)	0.19 (9)	3.3115 (7)	3.3065 (8)	1.579	1.568

Symmetry code: (ii) x, −1 + y, z.