Za is phenyl substituted with 0–3 Rc, naphthyl substituted with 0–3 Rc, or a heterocycle substituted with 0–3 Rc and selected from the group: {TAIL ~ pyridyl}, quinolinyl, tetrahydroquinolinyl, isoquinolinyl, tetrahydro isoquinolinyl, imidazolyl, pyridoimidazolyl, benzimidazolyl, indolyl, {HEAD ~ indolinyl}, 1,1 dioxido 2,3 dihydro 4H 1,4 benzothiazin 4 yl, 1,1 dioxido 3,4 dihydro 2H 1 benzothiopyran 4 yl, 3,4 dihydro 2H chromen 4 yl, 2H chromen 4 yl, pyrazolyl, and pyrazolopyridinyl 
Za is phenyl substituted with 0–3 Rc , naphthyl substituted with 0–3 Rc , or a heterocycle substituted with 0–3 Rc and selected from the group : { TAIL ~ pyridyl } , quinolinyl , tetrahydroquinolinyl , isoquinolinyl , tetrahydro isoquinolinyl , imidazolyl , pyridoimidazolyl , benzimidazolyl , indolyl , { HEAD ~ indolinyl } , 1,1 dioxido 2,3 dihydro 4H 1,4 benzothiazin 4 yl , 1,1 dioxido 3,4 dihydro 2H 1 benzothiopyran 4 yl , 3,4 dihydro 2H chromen 4 yl , 2H chromen 4 yl , pyrazolyl , and pyrazolopyridinyl
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