1. Department of Chemistry, The University of Wollongong, Wollongong, NSW 2522, Australia, Medicinal Chemistry Group, Mothers & Babies Health Research Centre, The Department of Chemistry, The University of Newcastle, Callaghan, NSW 2308, Australia, and Department of Endocrinology, Mothers & Babies Health Research Centre, John Hunter Hospital, The University of Newcastle, Newcastle, NSW 2310, Australia