Synonyms: (1R,2S,4S,5E,7R,12S)-12-Bromo-4-[(R)-3-bromo-1,2-propadienyl]-7-chloro-2-methyl-3,13-dioxabicyclo[7.3.1]trideca-5,9-diene;(1R,2S,5E)-2α-Methyl-4α-[(R)-3-bromo-1,2-propadienyl]-7α-chloro-12α-bromo-3,13-dioxabicyclo[7.3.1]trideca-5,9-diene;Obtusallene;Obtusallene I