prov:value
| - DETAILED DESCRIPTION The compounds of the present invention have the following formula I am I in which Z is methylene or carbonyl, R is hydrogen, a lower alkyl such as methyl ethyl, isopropyl or butyl, an aralkyl containing 7 to 13 carbon atoms, especially a phenyl-lower alkyl such as benzyl, phenethyl, and phenylisopropyl, phenyl, a halo-substituted phenyl such as pchlorophenyl or o-chlorophenyl,
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