1. School of Chemistry and Analytical and Biological Chemistry Research Facility, University College Cork, Cork T12 YN60, Ireland
2. Community for Open Antimicrobial Drug Discovery, Centre for Superbug Solutions, Institute for Molecular Bioscience, The University of Queensland, St. Lucia, Queensland 4072, Australia
3. School of Microbiology, University College Cork, Cork T12 K8AF, Ireland