ubstituted with at least one halogen atom, hydroxyl or nitro group, or (d) a radical ???OR12, wherein R12 is a hydrogen atom, a linear or branched alkyl radical having from 1 to 20 carbon atoms, an alkenyl radical having 2 to 5 carbon atoms and at least one site of ethylenic unsaturation, a mono- or polyhydroxyalkyl radical respectively having 2 to 3 carbon atoms or 3 to 6 carbon atoms and 2 to 5