methyl 2-methylsulfonyloxy-3-oxobutanoate

1-(2,6-dimethylidene-4-bicyclo[3.1.0]hexanyl)propan-2-one

dimethyl 2,4-diacetyl-3-(3-nitrophenyl)pentanedioate

1,5-dimethyl-2,6,9-triazabicyclo[3.3.1]nonane-3,7-dione

methyl 2-acetyl-5-chloropentanoate