1. Centre for Molecular Biodiversity, Institute for Molecular Biosciences, University of Queensland, St. Lucia, Queensland 4072, Australia, School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia, Microbial Screening Technologies Pty. Ltd., Kemps Creek, New South Wales 2171, Australia, and Novartis Animal Health Pty. Ltd., Kemps Creek, New South Wales 2171, Australia