8,9-dimethyl-5,6-dihydro-4H-benzo[1,2]cyclohepta[6,7-b]furan-2,3-dione

4-(2-甲氧基苯基)-2,4-二氧代丁酸

1,10-二氧杂-4,7,13,16-四氮杂环十八烷-5,6,14,15-四酮

1,4,7,10,13-pentaoxacyclopentadecane-2,3-dione

dimethyl 2-oxo-3-phenylbutanedioate