Provided are compounds of formula (I): wherein R1, R2, R3, R4 and R5 are independently selected from the group comprising, inter aliae, H, optionally substituted, branched or linear C1-C12 alkyl, halogen atom and C1-C12 haloalkyl, and wherein A represents a single bond or an optionally substituted C1-C6 alkylene radical, notably useful for the treatment of human cancers.