5 - methoxy - 7 - hydroxyflavan compound was isolated and purified from dragon &# 39 ; s blood resin . the purification process involves 50 % ethanol soxhletion overnight and then fraction through silica column with a series of solvent elution . the purified compound was crystallized in benzene : hexane . the pure compound was identified by instruments including ir , nmr , fab - ms , and gc - ms and acetylation reaction to confirm the structure . this compound was found to be a strong antifungal chemical with broad spectra against fusarium oxysporium fsp . niveum , phytophora capsici , phoma asparagi , pythium spinosum , pythium aphanidermatum , phthium sylvaticum , sclerotium rolfsii , and sclerotinia sclerotiorum . for whole plant in vivo testes , it was found that compound significantly protected mung bean and cabbage from being infested and damaged by sclerotium rolfsii and pythium aphanidermatum respectively . toxicology experiments with compound , it shown no toxcity or effect to animals by peroral 300 mg / kg or intraperitoneal 100 mg / kg . it is a definite conclusion that compound is a safe fungicide in agriculture .