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

phenylenediamine paraphenylenediamine ppd aniline polymer plastic hair dye aramid precursor urethane polyurethane pur antioxidant antiozonant allergen contact allergenic hydrogen carbon nitrogen molecule atoms atomic model molecular compound composition chemical chemistry bond structure formula circle ring line drawing skeletal flat icon stylized style