| http://www.w3.org/ns/prov#value | - The invention is particularly directed to compounds as follows, where: [0016] R2 and R3 are both cyclohexyl, or [0017] R3, when it is lower alkyl, is methyl, ethyl, propyl, or butyl, or [0018] R4, when it is lower alkyl, is methyl or ethyl (especially compounds where R3 and R4 are both so defined), or [0019] R1, when substituted, is substituted with halo, lower alkyl, or ???(R5)n???C(O)???OR6, or
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