Patent ID: 7446125

Claim:
A compound of formula (I) or a salt thereof, wherein: n is selected from 0 to 5; each of R 1 , R 3 and R 4 is individually selected from a substituted or unsubstituted cyclic, linear or branched C1-C8 alkyl group and a substituted or unsubstituted phenyl, benzyl, aryl or heteroaryl group; wherein each of R 1 , R 3 and R 4 is optionally substituted with 1-6 atoms or groups selected from halogen; linear, branched or cyclic alkyl or alkoxy; benzyloxy; trifluoromethyl; trichloromethyl; nitro; hydroxyl and amino groups; R 2 is selected from a hydrogen atom and a C1-C8 linear or branched alkyl group; each of R 5 and R 6 is individually selected from a hydrogen atom; a straight, branched or cyclic alkyl, aryl, heteroaryl, mono- or polysubstituted aryl group; a mono- or polysubstituents heteroaryl group; a benzyl group; and a mono- or polysubstituted benzyl group; and X is selected from a nitro group, an amido group and an amino group.