4-hydroxy-3(1-carboxy-3-methylbut-1-enyl)-2-quinolone

3-isobutylidene-2,4-dioxo-2,3,4,5-tetrahydrofuro(3,2-c)quinoline

4-hydroxy-3-isobutylidene-2-oxo-2,3-dihydrofuro(2,3-b)quinoline

4-羟基-3-甲基-2(1h)-喹啉酮

3,3-二甲基丙烯酸