Studies on diketopiperazine and dipeptide analogs as opioid receptor ligands

Siavash Shahbazi Nia, Mohammad Anwar Hossain, Guangchen Ji, Sravan K. Jonnalagadda, Samuel Obeng, Md Ashrafur Rahman, Ali Ehsan Sifat, Saeideh Nozohouri, Collin Blackwell, Dhavalkumar Patel, Jon Thompson, Scott Runyon, Takato Hiranita, Christopher R. McCurdy, Lance McMahon, Thomas J. Abbruscato, Paul C. Trippier, Volker Neugebauer, Nadezhda A. German