A dimeric iridoid from loasa acerifolia.

Reinvestigation of leaf material from Loasa acerifolia DOMBEY led to the isolation of secoxyloganin and an additional novel dimeric iridoid glucoside named asaolaside. The latter consists of a secoxyloganin moiety esterified to the 7-hydroxy group of sylvestroside IV. The structure of asaolaside was established by 1D and 2D NMR ((1)H (1)H COSY, HMQC, HMBC) and FABMS experiments.