Protostane triterpenoids from the rhizome of Alisma orientale exhibit inhibitory effects on human carboxylesterase 2 - Mai, Z P; Wang, C; Huo, X K; Dong, P P; Deng, S; Zhang, B J; Zhang, H L; Huang, S S; Ma, X C; Zhou, K; Ge, G B (J Nat Prod, 2015)