Iridoid glucosides from Penstemon ovatus

In addition to aucubin, 6beta-hydroxyboschnaloside, and 6-O-(8"-hydroxy-2",6"-dimethyl-2"(E), 6"(E)-octadienoyl)-6beta-hydroxyboschnaloside, the new iridoid glucoside ovatuside has been isolated from the aerial parts of Penstemon ovatus. This iridoid was shown to be 6-O-(8"-hydroxy-2",6"-dimethyl-2"(E),6"(Z)-octadienoyl)-6beta-hydroxyboschnaloside.