Ladroside (= 6′-Caffeoyl-mussaenoside), a New Iridoid Glucoside from Veronica officinalis L. (Scrophulariaceae) and the elucidation of the absolute configuration at C(8) of mussaenoside

A new iridoid glucoside, named ladroside, together with mussaenoside (1) 2], has been isolated from Veronica officinalis L . The structure of ladroside (4) and the identity of mussaenoside have been established by spectral analysis. Additionally, the absolute configuration at C(8) carrying the tertiary hydroxyl group has been established by chemical evidence.