Patent ID: 6870028

Claim:
A compound of general formula I wherein: R 1 and R 70 independently represent a hydrogen atom or an optionally substituted alkyl or acyl group with the proviso that when R 71 is hydrogen as hereinafter described, R 70 is not hydrogen; R 2 represents a hydrogen atom, an alkyl or benzoyl group or an alkyl group substituted with one or more halo, nitro, cyano, alkoxy, hydroxy, amino, alkylamino, sulphinyl, alkylsulphinyl, sulphonyl, alkylsulphonyl, amido, alkylamido, alkoxycarbonyl, haloalkoxycarbonyl or haloalkyl groups; R 73 represents a hydrogen atom or an optional substituent; Y represents an optional substituent; n represents 0, 1, 2, 3, or 4; R 3 represents a hydrogen atom, or an optionally substituted alkyl group; R 74 represents a hydrogen atom, a hydroxy group or an optionally substituted alkyl or acyl group; R 7 represents a hydrogen atom or an alkyl group; R 75 represents an optionally substituted alkyl group or —Q′—C(O)X, wherein Q′ is an optionally substituted —CH 2 —, —CH 2 CH 2 —, —CH 2 CH 2 CH 2 —, —CH 2 CH═CH—, —CH 2 C≡C—, or phenylene, X is —OR 8 , —SR 8 , or —NR 9 R 10 , and R 8 , R 9 and R 10 independently represent a hydrogen atom or an optionally substituted alkyl group; and i) R 6 represents a hydrogen atom, an alkyl or benzoyl group or an alkyl group substituted with one or more halo, nitro, cyano, alkoxy, hydroxy, amino, alkylamino, sulphinyl, alkylsulphinyl, sulphonyl, alkylsulphonyl, amido, alkylamido, alkoxycarbonyl, haloalkoxycarbonyl or haloalkyl groups; R 71 represents a hydrogen atom or an optionally substituted alkyl or acyl group; and R 72 represents a hydrogen atom; or ii) R 6 represents a hydrogen atom, an alkyl group, or an alkyl group substituted with one or more halo, nitro, cyano, alkoxy, hydroxy, amino, alkylamino, sulphinyl, alkylsulphinyl, sulphonyl, alkylsulphonyl, amido, alkylamido, alkoxycarbonyl, haloalkoxycarbonyl or haloalkyl groups, and R 71 and R 72 are joined together such that a double bond is formed between the carbon atoms to which they are attached; with the proviso that when R 6 , R 7 , R 70 and R 71 are methyl; R 2 , R 72 , R 73 and R 74 are hydrogen; R 3 is t-butyl; R 75 is —CH(CH(CH 3 ) 2 )C(H)═C(CH 3 )COOH or —CH(CH(CH 3 ) 2 )C(H)═C(CH 3 )COOCH 3 ; and n is 0, R 1 is not methyl.