| abstract |
The invention concerns compounds of formula I <IMAGE> I in which R1 is hydrogen or a straight or branched hydrocarbon chain; R2 is hydrogen or a straight or branched hydrocarbon chain; R3 is acyl; X1 is hydrogen, fluorine or chlorine; and X2 is hydrogen, fluorine or chlorine. Also disclosed are processes for preparation of the compounds, pharmaceutical compositions containing them and methods employing the compounds in the treatment of inflammatory and allergic conditions. |