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1 Division of Biochemistry, Columbus Laboratories, Battelle Memorial institute, Columbus, Ohio
The preferred conformations of ephedrine and
-ephedrine isomers have been deduced from molecular orbital calculations of total energy as a function of molecular geometry. A pattern of complementary features has been proposed which represents the alpha adrenergic receptor. The declining order of alpha adrenergic activity of the four isomers of ephedrine is explained satisfactorily by this proposed receptor model.