2,3,4,6,8-Pentahydroxy-1-methylxanthone is a xanthone derivative of Wardomyces anomalus. 2,3,4,6,8-Pentahydroxy-1-methylxanthone shows significant antioxidant activities. 2,3,4,6,8-Pentahydroxy-1-methylxanthone is inhibitors of p56 lck tyrosine kinase. 2,3,4,6,8-Pentahydroxy-1-methylxanthone can be used to treat cardiovascular disease.