%0 Journal Article %A Ghisalberti, EL %A Jefferies, PR %A Mori, TA %A Patrick, VA %A White, AH %T The chemistry of Eremophila spp. XIX. New cembrane diterpenes from E. granitica and E. abietina %J Australian Journal of Chemistry %D 1983/06/01 %V 36 %N 6 %P 1187-1196 %K %R https://doi.org/10.1071/CH9831187 %U https://www.publish.csiro.au/paper/CH9831187 %X The isolation and structural elucidation of five new cembrane diterpenes from two Eremophila species is reported. (1R,3S,4S,7E,11Z)-3,15-Epoxy-19-oxocembra-7,11-dien-18-oic acid (3) and (1R,3S,4S,7Z,11Z)-3,15-epoxycembra-7,11-dien-18-oic acid (7) were isolated from E. granitica, and dimethyl(1R,3S,4S,7E,11Z)-3,15-epoxycembra-7,11-diene-18,19-dioate (16), (1R,3S,4S,8R,11Z)-3,15-epoxycembr-11-ene-18,19-dioic acid (14) and its dimethyl ester were isolated from E. abietina. Structural studies on the diol derived from (14) were carried out by single-crystal X-ray diffraction analysis.