. . . "dicals; [0074] R14 is chosen from a hydrogen atom, a halogen atom such as fluorine, and C1-C4 alkyl, C1-C4 monohydroxyalkyl, C2-C4 polyhydroxyalkyl, C1-C4 aminoalkyl, C1-C4 cyanoalkyl, and (C1-C4)alkoxy(C1-C4)alkyl radicals. [0075] Among the para-aminophenols of formula (IV) above, mention may be made, for example, of para-aminophenol, 4-amino-3-methylphenol, 4-amino-3-fluorophenol, 4-amino-3-hydr" .