has role is protonated form of has functional parent independent continuant emodin anthrone antineoplastic agent trihydroxyanthraquinone tyrosine kinase inhibitor emodin A trihydroxyanthraquinone that is 9,10-anthraquinone which is substituted by hydroxy groups at positions 1, 3, and 8 and by a methyl group at position 6. It is present in the roots and barks of numerous plants (particularly rhubarb and buckthorn), moulds, and lichens. It is an active ingredient of various Chinese herbs. CHEBI:42223 laxative plant metabolite emodin(1-)