Furanosesquiterpenoids of Commiphora erythraea and C. myrrh

Abstract The isolation and structure determination of two new furanosesquiterpenoids, 2- O -acetyl-8,12-epoxygermacra-1(10),4,7,11-tetraene and 2- O -methyl-8,12-epoxygermacra-1(10)-4,7,11-tetraene, from gum exudates of Commiphora myrrh are reported. These two compounds, together with the known furanodienone isolated from C. erythraea , were found to have ixodicidal activity against Rhipicephalus appendiculatus tick larvae.