Conjugates of a secoiridoid glucoside with a phenolic glucoside from the flower buds of Lonicera japonica Thunb

Conjugates of a secoiridoid glucoside with a phenolic glucoside and with a nicotinic acid derivative were isolated from the MeOH extract of the flower buds of Lonicera japonica, together with seven known secoridoids. Their structures were elucidated by extensive spectroscopic analyses.