methyl 3-(4,5-dihydro-5-oxo-2-phenyloxazol-4-yl)-3-phenylacrylate

methyl 2,6-diphenyl-5,6-dihydrofuro[3,2-d][1,3]oxazole-5-carboxylate

methyl (5-oxo-2,7-diphenyl-5H-pyrano[3,2-d][1,3]oxazol-6(7H)-ylidene)ethanoate

三苯基磷

ethyl 2,6-diphenyl-5,6-dihydrofuro[3,2-d][1,3]oxazole-5-carboxylate