1,3-Dihydroxy-9,10-anthracenedione 1,3-Dihydroxyanthraquinone 4-08-00-03259 (Beilstein Handbook Reference) 518-83-2 9,10-Anthracenedione, 1,3-dihydroxy- (9CI) Anthraquinone, 1,3-dihydroxy- BRN 1979394 C.I. 75340 CCRIS 3523 Purpuro Purpuroxathin Purpuroxathine Xanthopurpin Xanthopurpurin