α-Copaene and β-Copaene

(–)-α-Copaene

(1R,2S,6S,7S,8S)-1,3-dimethyl-8-(propan-2-yl)tricyclo[4.4.0.0^2,7]dec-3-ene

(–)-β-Copaene

(1R,2S,6S,7S,8S)-1-methyl-3-methanylidene-8-(propan-2-yl)tricyclo[4.4.0.0^2,7]decane