Leaves of Eupatorium adenophorum were collected from Sichuan Province of China in May 2014. The plant was identified by Prof. Aocheng Cao at the Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing. Voucher specimen no. 20060712 was deposited at the College of Chemistry, Beijing Normal University. No specific permission was required as the plant material was sourced from uncultivated land, and the field studies did not involve endangered or protected species.