Study on chemical constituents from cultivated Gynura nepalensis Discussion on translation of ionone and megastigmane Discussion on translation of ionone and megastigmane Study on terpenoids from aerial parts of Matteuccia struthiopteris Chemical constituents from Chinese mangrove plant Cerbera manghas Megastigmane Sesquiterpenes and Phenylpropanols from Epimedium pseudowushanese