Table 1. Selected torsion angles (°).

C3A—C4A—C5A—O1A	172.0 (10)	C7A—C6A—N1A—C5A	−171.1 (7)
C3B—C4B—C5B—O1B	−169.2 (9)	O1B—C5B—N1B—C6B	10.8 (13)
O1A—C5A—N1A—C6A	−4.0 (13)	C4B—C5B—N1B—C6B	−166.0 (7)
C4A—C5A—N1A—C6A	176.0 (6)	C7B—C6B—N1B—C5B	−106.8 (9)