1. Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, Research School of Chemistry, Australian National University, Acton, Canberra, Australian Capital Territory 2601, Australia
2. Research School of Chemistry, Australian National University, Acton, Canberra 2601, Australia
3. Australian Research Council Centre of Excellence for Innovations in Peptide and Protein Science, The University of Sydney, Sydney, New South Wales 2006, Australia
4. School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia