Antidiarrheal and central nervous system activities of SC-27166 (2-[3 - 5 - methyl - 1, 3, 4 - oxadiazol - 2 - yl) - 3, 3 - diphenylpropyl] - 2 - azabicyclo [2.2.2]octane), a new antidiarrheal agent, resulting from binding to opiate receptor sites of brain and myenteric plexus.