4,4'-(1,2-Ethenediyl)bisbenzenamine 4,4'-Diaminostilbene 4,4'-Stilbenediamine 4,4'-Vinylenedianiline 4:4'-Diaminostilbene 621-96-5 Benzenamine, 4,4'-(1,2-ethenediyl)bis- (9CI) CCRIS 5146 NSC 403525