4-acetyl-5-methylhex-4-enenitrile

1-chloro-4-methylpent-3-en-2-one

ethyl 3,3-dimethyl-2,5-dioxohexanoate

2,2,4-trimethylpyrano[3,2-c]chromen-5-one

2-hydroxy-2,4,4-trimethyl-3,4-dihydro-2H,5H-pyrano[3,2-c]benzopyran-5-one