1. Laboratório de Química de Produtos Naturais, Centra de Pesquisas “René Rachou” Fundação Oswaldo Cruz, Cx Postal 1743, CEP 30190-002, Belo Horizonte, MG, Brazil
2. Institut de Pharmacognosie et Phytochimie, École de Pharmacie, Univ. de Lausanne, Lausanne, CHI015, Switzerland
3. Centre for Natural Product Research, Institute of Molecular and Cell Biology, National University of Singapore, Singapore, 0511 R, Singapore