specific ligands for sigma-opiate receptors , such as ( + ) skf 10,047 ( n-allylnorcyclazocine ) , phencyclidine ( pcp ) , and ( - ) cyclazocine , displaced specifically bound [ 3h ] etorphine and [ 3h ] ekc from nil membranes only at high ( micromolar ) concentrations .
C0010526
cyclazocine
C0079314
ekc