Patent ID: 6946461

Claim:
A compound of formula IIA, or a pharmaceutically acceptable salt thereof: wherein X 1 represents methyl-triazolyl, ethyl-triazolyl, propyl-triazolyl, isopropyl-triazolyl, 1 ,2,4-oxadiazolyl, methyl-thiazolyl, 5-hydroxy-1,2,4-triazolyl, trifluoromethylpyridyl, methyl-imidazolyl, amino-thiazolyl, amino-1,2,4-thiadiazolyl, methyl-tetrazolyl, pyridyl-triazolyl, and methyl-pyrazolyl, thiazolyl, pyridinyl, pyridazinyl, oxazolopyridinyl, pyrimidinyl, pyrazinyl, or quinoxalinyl, any of which groups may be optionally substituted by one or more of C 1-6 alkyl, amino, pyridyl, CF 3 , aryl(C 1-6 )alkyl, pyridyl(C 1-6 )alkyl, halogen, cyano, cyano(C 1-6 )alkyl, hydroxymethyl, C 1-6 alkoxy, C 3-6 cycloalkyl(C 1-6 )alkoxy, hydroxy or the keto tautomer thereof, di(C 1-6 )alkylamino(C 1-6 )alkyl, amino(C 1-6 )alkyl, N-(C 1-6 )alkylpiperidinyl, pyrrolidinyl(C 1-6 )alkyl, piperazinyl(C 1-6 )alkyl and morpholinyl(C 1-6 )alkyl; and Z 1 represents a 5-membered heteroaromatic ring containing one oxygen and one or two nitrogen ring atoms which is optionally substituted with C 1-6 alkyl or C 1-6 alkoxy.