Bibliografisk träff 1989-03-01 New 4-(heteroanilido)piperidines, structurally related to the pure opioid agonist fentanyl, with agonist and/or antagonist properties. Bagley JR, Wynn RL, Rudo FG, Doorley BM, Spencer HK, Spaulding T. J Med Chem · journal article · DOI 10.1021/jm00123a028