2-O-(1-ethoxy-1-oxonon-2-en-2-yl) 1-O-ethyl oxalate

2-(oxamoylamino)benzoate

oxophosphonoacetic acid triethyl ester

ethyl 2-(6-hydroxy-2,3,4-trimethoxyphenyl)-2-oxoacetate

ethyl 6-bromo-4-oxo-4H-benzo[d][1,3]oxazine-2-carboxylate