New erigeroster compound with medicinal activity

The invention relates to a new compound with a structural formula (I) or a pharmaceutically acceptable salt thereof. The compound can be obtained by extracting and separating the dried complete herb of Erigeron breviscapus (Vant.) Hand.-Mazz. The compound has the effects of resisting inflammatory response, resisting platelet aggregation, resisting thrombus and expanding blood vessels, and can be used for preparing medicaments for treating heart cerebrovascular diseases.