SEARCH Articles Figures Tables 1 -Hydroxy-2-methyl-anthraquinon 1 -Hydroxy-2-methyl-anthraquinone Anthraquinone Anthraquinones Dihydroxy methyl anthraquinone Methyl anthraquinone, effect Methyl anthraquinone, effect retention Trihydroxy-methyl-anthraquinone