Bispecific sigma-1 receptor antagonism and mu-opioid receptor partial agonism: WLB-73502, an analgesic with improved efficacy and safety profile compared to strong opioids oleh Alba Vidal-Torres, Begoña Fernández-Pastor, Mónica García, Eva Ayet, Anna Cabot, Javier Burgueño, Xavier Monroy, Bertrand Aubel, Xavier Codony, Luz Romero, Rosalía Pascual, Maria Teresa Serafini, Gregorio Encina, Carmen Almansa, Daniel Zamanillo, Manuel Merlos, José Miguel Vela