The invention provides a compound named as 2-methyl-5-(3,4-dihydroxyphenyl)pyridine. The compound is capable of eliminating oxygen free radicals and has wide application prospects in the treatment of diseases relevant with cell breaking capacity of free radicals of a human body. The invention further provides an extraction method of 2-methyl-5-(3,4-dihydroxyphenyl)pyridine. The extraction method comprises the steps of firstly carrying out cold-soaked extraction on blaps rynehopetera fairmaire powder so as to obtain an extracting solution, and carrying out extraction, first silica gel column chromatography separation, second silica gel column chromatography separation, ODS reversed-phase column chromatography separation, third silica gel column chromatography separation and gel column chromatography separation, so as to obtain 2-methyl-5-(3,4-dihydroxyphenyl)pyridine. The extraction method has the beneficial effects that the steps are simple, the cost is low, the raw material sources are wide, and industrial production is easily realized.