prov:value
| - The compounds of claim 3, wherein R2 is a member selected from the class consisting of butyl, cyclohexylmethyl and benzyl and R1 is a member selected from the class consisting of 4-methoxy-1-naphthyl, 4-methoxy-2-naphthyl, 5-methoxy-1-naphthyl, 6-methoxy-2-naphthyl, 7-methoxy-2-naphthyl, 1-methoxy-2-naphthyl, 5-ethoxy-1-naphthyl, 5-propoxy-1-naphthyl, 5-isopropoxy-1-naphthyl, 5-ethoxycarbonyloxy-1
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