1. Laboratory of Phycology, Department of Botany, Federal University of São Carlos (Ufscar), São Carlos, Brazil
2. Programa de Pós-Graduação em Ecologia e Recursos Naturais (PPGERN), Federal University of São Carlos, São Carlos, Brazil
3. Department of Pharmacy, Section Pharmaceutical Chemistry, University of Oslo, P O Box 1068 Blindern, 0316, Oslo, Norway