%0 Journal Article %T A DFT and Semiempirical Model-Based Study of Opioid Receptor Affinity and Selectivity in a Group of Molecules with a Morphine Structural Core %A Tamara Bruna-Larenas %A Juan S. Gó %A mez-Jeria %J International Journal of Medicinal Chemistry %D 2012 %I Hindawi Publishing Corporation %R 10.1155/2012/682495 %U http://dx.doi.org/10.1155/2012/682495