Í 1937 varð tað mest umfatandi p-fenylenediamin anti-aging evnið uppfunnið, sum varð kallað "4000 røð anti-aging evnum", harímillum 4010, 4010NA, 4020, 4030.
Antioxidant 4010NA: Eisini kent sum antioxidant IPPD, N-isopropyl-N, fenyl-p-fenylenediamin.
Antioxidant 4010: Eisini kent sum antioxidant CPPD, N-cyclohexyl-N'-fenyl-p-fenylenediamin.
Antioxidant 4020: Eisini kent sum antioxidant 6PPD, N-(1,{4}}dimetyl)butning-N'-fenylen-p-fenylenediamin{{9}
Antioxidant 4030: Eisini kent sum antioxidant 7PPD, N, N'-bis(1,{4}} dimetetylpentyl)-p-fenylenediamin.