p-phenylenediamine ppd hair dye molecule. also precursor in polymer synthesis. known contact allergen, possibly carcinogenic..

ppd hair dye molecule also precursor polymer synthesis known contact allergen possibly carcinogenic phenylenediamine paraphenylenediamine aniline plastic aramid urethane polyurethane pur antioxidant antiozonant allergenic hydrogen carbon nitrogen atoms atomic molecular compound composition chemical chemistry structure formula line drawing skeletal flat icon