3H-furo[3,4-b]quinolin-1-one

4-溴-2(5h)-呋喃酮

2-(2,4-dioxooxolan-3-yl)sulfanylisoindole-1,3-dione

(3Z)-3-(4-甲氧基苄亚基)-2,4(3H,5H)-呋喃二酮

trifluoromethanesulfonic acid 5-oxo-2,5-dihydrofuran-3-yl ester