1. Departamento de Química; Instituto de Ciências Exatas; Universidade Federal de Minas Gerais; Av. Antônio Carlos 6627 Belo Horizonte MG 31270-901 Brazil
2. Natural Products Laboratory; Institute of Biology Leiden; Leiden University; 2300 RA Leiden The Netherlands
3. Naturalis Biodiversity Center; Darwinweg 2 2333 CR Leiden The Netherlands
4. Institute of Biology Leiden; Leiden University; The Netherlands
5. Centre for Ecological and Evolutionary Studies; Rijksuniversiteit Groningen; Nijenborg 7 9747 AG Groningen The Netherlands