Synonyms: 1H-Cycloprop[e]azulene,1a,2,3,4,4a,5,6,7b-octahydro-1,1,4,7-tetramethyl-, [1aR-(1aa,4a,4ab,7ba)]-;1H-Cycloprop[e]azulene, 1ab,2,3,4,4aa,5,6,7bb-octahydro-1,1,4b,7-tetramethyl- (8CI);a-Gurjunene (6CI,7CI);(-)-a-Gurjunene;1a,2,3,4,4a,5,6,7b-Octahydro-1,1,4,7-tetramethyl-[1aR-(1aa,4a,4ab,7ba)]-1H-cycloprop[e]azulene;a-Gurjunene, (-)-