ethyl 2-(5-oxo-6,7,8,9-tetrahydro-5H-benzo[7]annulene-6-yl)acetate

5-oxobenzocycloheptane-Δ6,α-acetic acid

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

methyl 1-oxo-6,7,8,9-tetrahydro-5H-benzo[7]annulene-6-carboxylate

溴乙酸乙酯