8a-methyl-1-(3-oxobutyl)-1,3,4,4a,4b,5,6,7,8,9,10,10a-dodecahydrophenanthren-2-one

2-bromo-1-phenylhexane-1,5-dione

2-methyl-2-(3-oxobutyl)cyclopentan-1-one

2-甲基-2-(3-氧代-丁基)-环己酮