Synonyms: 1,4-Benzenediamine, N-phenyl-N'-(2,2,6,6-tetramethyl-4- piperidinyl)-;N~1~-Phenyl-N~4~-(2,2,6,6-tetramethyl-4-piperidinyl)-1,4-benzenediamine;N1-phenyl-N4-(2,2,6,6-tetramethyl-4-piperidinyl)-1,4-benzenediamine;N1-phenyl-N4-(2,2,6,6-tetramethyl-4-piperidyl)benzene-1,4-diamine