2,4,5-triphenyl-1,3-oxazin-6-one

methyl 3,5,6-triphenyl-4(1H)-pyridinone-2-carboxylate

methyl 3-(2-methoxy-2-oxoacetyl)-4-oxo-2,5,6-triphenyl-3,4-dihydropyridine-3-carboxylate

2-Hydroxy-4-oxo-3a,5,6-triphenyl-2,3,3a,4-tetrahydro-pyrrolo[1,2-b]isoxazole-2,3-dicarboxylic acid dimethyl ester

dimethyl 2,5,6-triphenylpyridine-3,4-dicarboxylate