(3aR,4R,7R)-1,4,9,9-tetramethyl-3,4,5,6,7,8-hexahydro-2H-3a,7-methanoazulene; (3aR,4R,7R)-2,4,5,6,7,8-Hexahydro-1,4,9,9-tetramethyl-3H-3a,7-methanoazulene; [3aR-(3a?,4?,7?)]-2,4,5,6,7,8-Hexahydro-1,4,9,9-tetramethyl-3H-3a,7-methanoazulene; (-)-2,4,5,6,7?,8-Hexahydro-1,4?,9,9-tetramethyl-3H-3a?,7-methanoazulene; (-)-Cyperene; NSC 241249