prov:value
| - The compounds of claim 1 wherein R1 is hydrogen and R2 is a member selected from the class consisting of alkyl, aryl, and cycloalkyl, respectively containing not more than 10 carbon atoms, and aralkyl and cycloalkylalkyl, respectively containing not more than 15 carbon atoms and R' is a member selected from the class consisting of 5,6,7,8-tetrahydro-1-naphthyl, 5,6,7,8-tetrahydro-2-naphthyl, 1-nap
|