[1] Univ Chile, Dept Quim Organ & Fisicoquim, Fac Ciencias Quim & Farmaceut, Santiago 1, Chile
[2] Pontificia Univ Catolica Chile, Fac Quim, Dept Quim Organ, Santiago, Chile
[3] Univ Chile, Unidad Graf Mol, Dept Quim Inorgan & Analit, Fac Ciencias Quim & Farmaceut, Santiago 1, Chile
[4] Pontificia Univ Catolica Chile, Dept Farm, Santiago 22, Chile
[5] Univ Chile, Fac Ciencias, Dept Quim, Santiago 1, Chile
[6] Univ Santiago Chile, Fac Ciencias Med, Escuela Med, Santiago, Chile
[7] Univ Autonoma Chile, Fac Ciencias Salud, Talca, Chile