3d image of p-phenylenediamine skeletal formula

p-phenylenediamine ppd organic compound derivative aniline paraphenylenediamine diaminobenzene phenylenediamine danger polymers kevlar hair dyes henna precursor aramid plastics twaron urethane para-aramid rubber antioxidant antiozonant contact dermatitis temporary tattoo patch tests rendering poison toxicant toxic toxicity toxin poisoning hazard acute environmental environment anthropogenic pollutant pollution damage substance matter material component agent stuff reagent synthesis reaction production