1-Hydroxy-6-methoxy-3-methyl-8-[(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)oxy]-9,10-anthracenedione is an intermediate in synthesizing Physcion 8-β-D-glucoside (P398100). Physcion 8-β-D-glucoside has been studied in research relating to the treatment of the glomerulonephritis. It is the glucoside of Physcion (P398000) which is a natural anthraquinone derivative, on the infection process of Blumeria graminis on wheat. Physcion is one of the important active ingredients of ethanol extract from the roots of Chinese rhubarb (Rheum officinale) for controlling powdery mildew.