The formation of 1: Pdi-(a-anthraquinony1amino) anthraquinone (I) and its conversion into a brown vat dye on being heated with potassium hydroxide, or a reddish-brown dye with aluminium chloride, were described in GP 208,969, 251,021, and 451,495, and the
![Benzamide,N-[5-[(9,10-dihydro-9,10-dioxo-1-anthracenyl)amino]-9,10-dihydro-9,10-dioxo-1-anthracenyl]- Structure](https://image.chemsrc.com/caspic/205/6370-69-0.png)