Opioid analgesics : chemistry and receptors / Alan F. Casy and Robert T. Parfitt. Casy, Alan F. Parfitt, Robert T. Opium. Analgesics. Analgesics Receptors. Narcotics Receptors. Endorphins Receptors. Endorphins. Narcotics. Receptors, Endorphin. RM666.O6 C33 1986 615.783 19 CAO Includes bibliographies and index. New York : Plenum, c1986. c1986. 1986 Text xv, 518 p. : eng