| abstract |
A compound of formula I in which R is methyl or ethyl; R1 is chlorine or fluorine; R2 is hydrogen or fluorine; R3 is hydrogen, fluorine, chlorine, methyl, ethyl, methoxy, ethoxy or hydroxy; R4 is hydrogen or fluorine; and R5 is chlorine, fluorine, trifluoromethyl or methyl; or a pharmaceutically acceptable salt thereof; or pharmaceutically acceptable prodrug esters thereof. |