3-hydroxy-3,6,7-trimethyl-oct-6-enoic acid ethyl ester

acetoacetic acid-(1,1,2-trimethyl-allyl ester)

乙酸酐

1-[(1S,3R)-2,2,3-三甲基环丁基]乙酮

2-acetyl-4,5-dimethyl-hex-4-enoic acid methyl ester