abstract |
A compound of the formula (I): wherein: R 1 is phenyl optionally substituted with halogen, cyano, C 1-4 alkyl or C 1-4 alkoxy; R2 is methyl; R is hydrogen, or CO2R is (CO2-) pRp + where Rp + is a univalent cation or two carboxylates that can coordinate a divalent cation; @p is 1 or 2; R3 is phenyl optionally substituted with halogen, cyano, C1-4 alkyl, C1-4 alkoxy, CF3 or OCF3; or an N-oxide thereof; or a pharmaceutically acceptable salt thereof. |