Predicted binding models of compounds 7, 8, 9 and 10 in complex with XIAP BIR3 protein. Predicted binding models are superimposed on the crystal structure of Smac in complex with XIAP BIR3. Protein is shown in surface with key binding residues shown and labeled. Compounds 7, 8, 9, 10 and AVPI peptide are shown in stick. Caron atoms in AVPI are shown in yellow and carbon atoms in 7, 8, 9, 10 are shown in green; oxygen and nitrogen atoms are shown in red and blue, respectively.