Brain passage of BUBU, a highly selective and potent agonist for δ opioid receptors: In vivo binding and μ versus δ receptors occupancy

1. Delay-Goyet, P.
2. Ruiz-Gayo, M.
3. Baamonde, A.
4. Gacel, G.
5. Morgat, J.-L.
6. Roques, B.P.