1. Medicinal ChemistryMonash Institute of Pharmaceutical Sciences, Monash University, 381 Royal ParadeParkville, VIC 3052 Australia
2. Department of Toxicology and PharmacologyUniversity of Leuven, O&N 2, Herestraat 49, P.O. Box 922Leuven, 3000 Belgium
3. Peptides InternationalLouisville Kentucky, 40299
4. Centro de Investigaciones Químicas, Universidad Autónoma del Estado de MorelosCuernavaca México