[1] Univ Fed Rio Grande do Sul, Inst Quim, Av Bento Goncalves 9500, BR-91501970 Porto Alegre, RS, Brazil
[2] Univ Bernardo OHiggins, Escuela Obstet & Puericultura, Ctr Integrat Biol & Quim Aplicada CIBQA, Santiago 8370993, Chile
[3] Univ Cologne, Dept Chem, Greinstr 6, D-50939 Cologne, Germany
[4] Univ Lisbon, Inst Super Tecn, Av Roviso Pais 1, P-1049001 Lisbon, Portugal