3,4-bis(4-methoxyphenyl)-2,5-dihydrofuran-2,5-dione

1-((3-(methoxycarbonyl)naphthalen-2-yl)methyl) 4-methyl but-2-enedioate

1H-benzo[f][2]benzofuran-3-one

1-十四吡咯-2,5-二酮

3-oxo-3a,4,5,7a-tetrahydro-1H-2-benzofuran-4-carboxylic acid