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1. A compound of the general formula:wherein
X represents O or S, R1 independently represents hydrogen; a straight or branched alkyl, alkenyl or alkynyl group containing up to 6 carbon atoms, optionally substituted by one or more halogen atoms or one or more groups R5; or a cycloalkyl or cycloalken group containing from 3 to 7 carbon atoms, said group optionally being substituted by one or more groups R5 or one or more halogen atoms, R2 represents a straight or branched alkyl, alkenyl or alkynyl group containing 3 to 24 carbon atoms, said group optionally being substituted by one or more halogen atoms, a cycloalkyl group containing from 3 to 6 carbon atoms, or one or more groups R5, R3 and R4 may independently represent hydrogen, a straight or branched alkyl, alkenyl or alkynyl group containing up to six carbon atoms, said group optionally being substituted by one or more halogen atoms, or may together with the nitrogen atom to which they are joined or together with R1 form 5 to 7 membered saturated or unsaturated heterocyclic ring containing up to three ring heteroatoms selected from nitrogen, oxygen and sulfur, which ring is optionally substituted by one or more groups selected from halogen, nitro, —S(O)pR6, C1-4 alkyl, C1-4 alkoxy, C1-4 haloalkyl, C1-4 haloalkoxy, ═O, and ═NO-R5, it being understood that a sulphur atom, where present in the ring, may be in the form of a group —SO2— or —SO—; R5 represents a straight or branched alkyl group containing up to six carbon atoms, said group optionally being substituted by one or more halogen atoms, a C1-4 alkoxy, or a straight or branched alkenyl or alkynyl group containing from 2 to 6 carbon atoms, said group optionally being substituted by one or more halogen atoms; and R6 represents a straight or branched alkyl group containing up to six carbon atoms, said group optionally being substituted by one or more halogen atoms; p is 0, 1, or 3 and pharmaceutically acceptable salts thereof. |
