Patent ID: 7851490

Claim:
A compound of the general formula (I): or an N-oxide thereof, or any of its stereoisomers or any mixture of its stereoisomers, or a pharmaceutically acceptable salt thereof, wherein R a , R b and R c independent of each other represent hydrogen, alkyl, cycloalkyl, cycloalkylakyl, alkenyl, alkynyl, hydroxy, alkoxy, alkoxyalkyl, arylalkyl, formyl, alkylcarbonyl or alkoxyalkylcarbonyl; R d represents a heteroaryl group; which heteroaryl group is optionally substituted with one or more substituents independently selected from the group consisting of: halo, hydroxy, R′R″N—, R′R″N-alkyl, cyano, nitro, trifluoromethyl, trifluoromethoxy, hydrazino, alkoxy, cycloalkoxy, alkyl, cycloalkyl, cycloalkylalkyl, alkenyl, and alkynyl; wherein R′ and R″ independent of each other are hydrogen or alkyl.