Iridoids from plantago lagopus.

Catalpol ( 1 ), harpagoside ( 2 ), aucubin ( 3 ), 10-benzoylcatalpol ( 4 ) and 6-a-hydroxy-geniposide ( 5 ) were isolated from the aerial parts of Plantago lagopus L. for the first time. More generally, this is the first report of compound 5 being obtained from a plant extract.