... 15) M. Takeda, G. Tsukamoto, K. Noguchi, S. Saito, and S. Nurimoto, Chem. ... May and Takeda have shown“) that the antagonist activity of the phenylmorphan (II) resides in its levo isomer [(-—)II] and we proposed“) that the unsub— stituted pro—S enantiotopic edge of the ...