2,3-dimethoxyanthra-9,10-quinone 22506-55-4 9,10-anthracenedione, 2,3-dimethoxy- InChI=1/C16H12O4/c1-19-13-7-11-12(8-14(13)20-2)16(18)10-6-4-3-5-9(10)15(11)17/h3-8H,1-2H