New compound methyl brevicate with medical activity

The invention relates to a new compound with a structural formula (I). The compound can be extracted and separated from the dry complete grass of Erigeron Breviscapus (Vant.) Hand.-Mazz. The compound has the effects of inflammatory reaction resistance, platelet aggregation resistance, thrombus resistance and blood vessel extension and can be used for preparing a medicament for treating a heart cerebrovascular disease. The structural formula (I) is shown in the specification.