| abstract |
A compound of formula (I) wherein; NA represents a 5-membered nitrogen containing heterocycle optionally substituted by a cyano group; Ak represents an alkylene chain; X represents a single bond or a phenylene group; R1 and R2 each represent H or alkyl; Y represents NR4 or CH-NO2, where R4 is H or alkyl; R3 represents alkyl, nitro or cyano when Y represents CH-NO2 or cyano or nitro when Y is NR4. Also described are pharmaceutical compositions containing formula (I) and a process for making it. |