“…Interesting differences were observed for dihedral angle values. In the case of acridine derivatives, ta was around À808 while in compound series 6 and 7, it was around À608/À708, except in 4 0 -substituted derivatives (-NH 2 and -OCH 3 substituents), where the values were around À548/À688, in close agreement with experimental data for 9-anilinoacridines [20,21].…”