“…Protostane‐type triterpenoind is an isomer of dammarane‐type triterpenoids, featuring α ‐configurations of 8‐CH 3 and 13‐H, and β ‐configurations of 9‐H and 14‐CH 3 . As characteristic constituents of the genus Alisma (Hur, Choi, & Park, 2007; Jiang et al, 2006), protostane‐type triterpenoids have a variety of functions, such as anti‐inflammatory, antibacterial, antioxidation, and antitumor activities (Na et al, 2016; Xu, Wang, Pu, Tao, & Zhang, 2018; Zhang, Men, & Lei, 2014).…”