Alignments of a XR9456 (no. 1, Table I), b XR9544 (no. 17, Table I), c compound 36 (structures displayed as sticks) on the lowest energy conformer of Hoechst 33342 (line display); red, O-atoms; blue, N-atoms; cyan, H-atoms; gray, C-atoms. Reprinted from (27) with permission from Elsevier