Stereoviews of the 10 lowest energy conformers of MTII (a), and SHU9119 (b). Structures were superimposed using the backbone heavy atoms of residues 5–10. Heavy atoms are shown with different colours (carbon, green; nitrogen, blue; oxygen, red). Hydrogen atoms are not shown for clarity (for interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)