Synonyms: 1,4-Dianilinobenzene; 1,4-Bis(phenylamino) benzene; p-bis(phenylamino)benzene; p-phenylaminodiphenylamine; p-phenylenediphenyldiamine; Agerite DPPD; diafen; diafen ff; Diphenyl PPD; DFFD; DPPD; ekaland dppd; flexamine g; JZF; naugard j; N,N'-diphenyl-1,4-Benzenediamine; N,N'-diphenyl-1,4-diaminobenzene; N,N'-diphenyl-1,4-phenylenediamine; nocrac dp; nonflex h; nonox dppd; permanax 18; permanax dppd; stabilizer dppd; ANTIOXIDANT H; N,N'-Diphenyl-p-phenylenediamine; 4,4’-diphenyl-p-phenylenediamine; 4,4'-Diphenyl-p-phenylenediamine; 4-Phenylaminodiphenylamine; Altofane DIP; altofanedip; Antage DP; antagedp; antigenep