alpha-(2-苯基亚肼基)脱氧安息香

4,5,6,7-tetrahydro-3H-2-benzofuran-1-one

ethyl 1,3,4,5,6,7-hexahydro-3-oxoisobenzofuran-1-carboxylate

2-ethoxy-3-methoxy-2-phenylchromene

tetraethyl benzene-1,2,4,5-tetracarboxylate