. "Purpurin, Purpurine, Hydroxylizaric acid" . . . "1,2,4-Trihydroxyanthraquinone" . . "1,2,4-Trihydroxyanthracene-9,10-dione" . . . "Purpurin" . . . . . "purpurin" . "1,2,4-Trihydroxyanthraquinone" . . . .