1. University of Campinas; Institute of Chemistry, Laboratory of Synthesis of Natural Products and Drugs; Rua Josué de Castro, s/n - Campinas SP 13083-970 Brazil
2. University of São Paulo; Institute of Chemistry - Av. Professor Lineu Prestes 748; São Paulo SP 05508-000 Brazil
3. University of Campinas; Institute of Chemistry, ThoMSon Mass Spectrometry Laboratory, Rua Monteiro Lobato; s/n - Campinas SP 13083-970 Brazil