(2,6,6-trimethylcyclohex-2-en-1-ylidene)methanone

甲基庚烯酮

1-chloro-2,6-dimethyl-hepta-1,5-diene

(E)-3,7-二甲基-2,6-辛二烯醛

2-cyano-5,9-dimethyl-deca-2,4,8-trienoic acid