1. Chemistry Department, Federal University of Paraíba, Joao Pessoa, PB, 58051-970, Brazil
2. Laboratory for Molecular Modeling, UNC Eshelman School of Pharmacy, University of North Carolina , Chapel Hill , North Carolina 27599, United States
3. Department of Organic Chemistry II, University of the Basque Country UPV/EHU, Leioa 48940, Spain