abstract |
This invention refers to compounds of the formula (1): wherein X is the atom of oxygen or sulfur, R1 is alkyl substituted by one or more atom of halogen, R2 is hydrogen, halogen or OH, R3 is a group R4 or R5, in which R4, Y and R5 are such as defined in the description, method for its preparation, pharmaceutical compositions comprising the same and use of such compositions. |