Pharmacological characterization of novel synthetic opioids: Isotonitazene, metonitazene, and piperidylthiambutene as potent μ-opioid receptor agonists

Maria Antonietta De Luca, Graziella Tocco, Rafaela Mostallino, Antonio Laus, Francesca Caria, Aurora Musa, Nicholas Pintori, Marcos Ucha, Celia Poza, Emilio Ambrosio, G. Di Chiara, M. Paola Castelli