Xanthopurpurin is an orally active anthraquinone glycoside. Xanthopurpurin can be isolated from the rhizome of Rubia akane. Xanthopurpurin has antiviral effects against rotavirus and HIV. Xanthopurpurin has a strong inhibitory effect on collagen-induced platelet aggregation. Xanthopurpurin prevents peanut allergy[1][2][3][4].