2,5-Cyclohexadiene-1,4-dione, 2,5-bis(phenylamino)- 2,5-Dianilino-1,4-benzoquinone 2,5-Dianilino-p-benzoquinone 3421-08-7 C.I. 56000 Helindon Yellow CA Helindon Yellow CAK NSC46456 p-Benzoquinone, 2,5-dianilino-