butane-1,3,3-tricarboxylic acid

methyl α-methyl-γ-carboethoxy-γ-acetylbutyrate

(1)-3-(Isopropyl)-6-methylcyclohex-2-en-1-one

4-methyl-cyclohexane-1,3-dione

1-methyl-2-oxocyclopentane-1-carbonitrile