Abstract:
            According to a first aspect of the invention there is provided compounds of formula (I): wherein: R is hydroxy; O-acetyl; or a halo atom; R is hydroxy; O-acetyl; or a halo atom; R is hydrogen; a halo atom; azido; C alkenyl; C alkynyl; C aryl C alkenyl; C arylC alkynyl âNR R (where R and R may be the same or different and are hydrogen, C alkyl, cyanoC alkyl, hydroxyC alkyl, haloC alkyl, C cycloalkyl, C alkylC cycloalkyl, C alkenyl, C cycloalkylC alkyl, C alkynyl, C aryl, C arylC alkyl, heterocycleC alkyl, C alkylcarbonyl, C arylsulfonyl, C alkysulfonyl, or R R together with the N atom to which they are attached form a 3,4,5 or 6 membered heterocyclic ring); âOR (where R is hydrogen, C alkyl, C aryl, or C arylC alkyl, C alkenyl, C alkynyl, C aryl C alkenyl or C arylC alkynyl); or âSR (where R is hydrogen, C alkyl, C aryl, or C arylC alkyl).