Iridoid Glucosides from Linociera sangda

A phytochemical investigation of the aerial parts of Linociera sangda led to the isolation of three new iridoid glucosides (1-3), together with nine known iridoid glucosides and a flavonoid glycoside, nicotiflorin. The structures of the new compounds were elucidated spectroscopically. Compounds 1-3 are members of a rare group of iridoids with a spirolactone ring, and compound 3 is the first instance of an adduct of iridoid glucoside and flavonoid glycoside.