branched or unbranched alkyl phenyl naphthyl or heterocyclic groups with each such heterocyclic group being independently selected from the group consisting of pyridinyl pyrimidinyl pyrazinyl pyridazinyl pyrrolyl imidazolyl pyrazolyl thienyl furyl isoxazolyl and isothiazolyl and each such phenyl naphthyl or heterocyclic group being substituted with 0 to 5 groups selected from halogen c 1 6 branched or unbranched alkyl which is optionally partially or fully halogenated cyclopropyl cyclobutyl cyclopentanyl cyclohexanyl cycloheptanyl bicyclopentanyl bicyclohexanyl bicycloheptanyl hydroxy cyano c 1 3 alkyloxy which is optionally partially or fully halogenated nh 2 c o and mono or di c 1 3 alkylaminocarbonyl d c 5 7 cycloalkenyl selected from the group consisting of cyclopentenyl cyclohexenyl cyclohexadienyl cycloheptenyl cycloheptadienyl bicyclohexenyl and bicycloheptenyl wherein such cycloalkenyl group is optionally substituted with one to three c 1 3 alkyl groups a c 1 6 branched or unbranched alkyl optionally partially or fully halogenated acetyl aroyl c 1 4 branched or unbranched alkoxy optionally partially or fully halogenated halogen methoxycarbonyl and phenylsulfonyl a a phenyl naphthyl or heterocyclic group selected from the group consisting of pyridinyl pyrimidinyl pyrazinyl pyridazinyl pyrrolyl imidazolyl pyrazolyl thienyl furyl tetrahydrofuryl isoxazolyl isothiazolyl quinolinyl isoquinolinyl indolyl benzimidazolyl benzofuranyl benzoxazolyl benzisoxazolyl benzpyrazolyl benzothiofuranyl cinnolinyl pterindinyl phthalazinyl naphthypyridinyl quinoxalinyl quinazolinyl purinyl and indazolyl wherein such phenyl naphthyl or heterocyclic group is optionally substituted with one to five groups selected from the group consisting of a c 1 6 branched or unbranched alkyl phenyl naphthyl heterocycle selected from the group hereinabove described c 1 6 branched or unbranched alkyl which is optionally partially or fuily halogenated cyclopropyl cyclobutyl cyclopentanyl cyclohexanyl cycloheptanyl bicyclopentanyl bicyclohexanyl bicycloheptanyl phenyl c 1 5 alkyl naphthyl c 1.