(delta9,9'(10H,10'H)-Bianthracene)-10,10'-dione (8CI) 10,10'-Bianthrone 434-85-5 9(10H)-Anthracenone, 10-(10-oxo-9(10H)-anthracenylidene)- Bianthrone Dehydrodianthrone EINECS 207-106-8 NSC 89778