A new hetero dimeric terpenoid derivative, japonicaside C, from the flower buds of Lonicera japonica.

A rare hetero dimeric terpenoid derivative, named japonicaside C, together with five known secoiridoid gloucosides were isolated from the flower buds of Lonicera japonica. The structures of these compounds were established on the basis of spectroscopic analyses. Japonicaside C is the first representative of a novel type of hetero dimeric terpenoid, biogenetically originated from a guaiane-type sesquiterpenoid and a secoiridoid glucoside. Anti-virus activity of the isolated compounds was evaluated in vitro.