Patent ID: 8691821

Claim:
A compound of formula I where; R 1 is hydrogen or alkyl; R 2 is hydrogen or alkyl; R 3 is Ar 1 is phenyl, pyridinyl, pyrazinyl, pyrimidinyl, or pyridazinyl, and is substituted with 1 R 3 substituent and with 0-3 substituents selected from halo, alkyl, haloalkyl, alkoxy, and haloalkoxy; Ar 2 is phenyl, pyridinyl, pyrazinyl, pyrimidinyl, pyridazinyl, pyrrolyl, furanyl, thienyl, pyrazolyl, isoxazolyl, isothiazolyl, imidazolyl, oxazolyl, thiazolyl, triazolyl, oxadiazolyl, thiadiazolyl, tetrazolyl, or benzimidazolyl, and is substituted with 0-3 substituents selected from halo, cyano, alkyl, haloalkyl, hydroxy, alkoxy, haloalkoxy, and phenyl; and Ar 3 is phenyl, pyridinyl, pyrazinyl, pyrimidinyl, pyridazinyl, imidazolyl, oxazolyl, thiazolyl, quinolinyl, isoquinolinyl, quinoxalinyl, or pyrrolopyridinyl, and is substituted with 0-3 substituents selected from halo, cyano, alkyl, haloalkyl, cycloalkyl, hydroxy, alkoxy, haloalkoxy, alkylcarbonyl, alkoxycarbonyl, alkylthio, amino, alkylamino, and dialkylamino; or a pharmaceutically acceptable salt thereof.