| 摘要 |
The present invention encompasses compounds of the formula: <IMAGE> wherein n is 0 or 1; Y represents ethylene or vinylene; R represents hydrogen or lower alkyl having 1-7 carbon atoms; R', R'', R''' each individually represent hydrogen or methyl; Ar represents phenyl, halosubstituted phenyl, alkyl substituted phenyl wherein the alkyl contains 1-4 carbon atoms, alkoxy substituted phenyl wherein the alkoxy contains 1-4 carbon atoms, trifluoromethylphenyl, or biphenyl; and the wavy line indicates R or S stereochemistry.
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