ethyl 3-diethoxyphosphoryl-2-oxobutanoate

ethyl 4-oxo-1-phenylquinazoline-2-carboxylate

ethyl 2-(3,5-dinitroanilino)-2-oxoacetate

ethyl 2-(1,3-benzothiazol-2-ylamino)-2-oxoacetate

methyl 2-(4-methoxy-7-(3-methyl-1H-1,2,4-triazol-1-yl)-1H-pyrrolo[2,3-c]pyridin-3-yl)-2-oxoacetate