Provided is a method for inhibiting blood vessel stenosis in a subject, comprising administrating to the subject an effective amount of an active ingredient selected from a group consisting of a compound of formula (I), a pharmaceutically acceptable salt of the compound, a pharmaceutically acceptable ester of the compound, and combinations thereof. Also provided is a method for inhibiting blood vessel stenosis in a subject, comprising administration to the subject an effective amount of an Angelicae Sinensis extract comprising the compound of formula (I).
