Montanone, a new sesquiterpene from Jasonia montana

The aerial parts of Jasonia montana afforded a new isoiphionane sesquiterpene, montanone 1. The structure of 1 was elucidated to be 11,15-dihydroxy-iphionane-4-one by high field 1D and 2D NMR techniques, including HMQC, NOESY and HMBC. אא אא  Jasonia montana  א