alizarin 1-methyl ether 1-Methoxy-2-hydroxy-9,10-anthraquinone 2-Hydroxy-1-methoxy-9,10-anthracenedione 2-Hydroxy-1-methoxy-9,10-anthraquinone 3-Hydroxy-4-methoxy-9,10-anthraquinone 2-Hydroxy-1-methoxyanthraquinone 9,10-Anthracenedione,2-hydroxy-1-methoxy- 2-Hydroxy-1-methoxyanthracene-9,10-dione