Synonyms: 1,4,5,8-Naphthalenetetracarboxylic1,8:4,5-diimide, N,N'-diphenyl- (8CI); 1,4,5,8-Naphthalenetetracarboxylic acidbis(phenylimide); N,N'-Diphenyl-1,4,5,8-naphthalenetetracarboxylic1,8:4,5-diimide; N,N'-Diphenyl-1,4,5,8-naphthalenetetracarboxylic acid diimide