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

(E)-2-(4-methoxy-2-oxo-1,2-dihydroquinolin-3-yl)-4-methylpent-2-enoic acid

4-methoxy-3-(3-methylbut-2-enyl)-1H-quinolin-2-one

4-Methoxy-3-((E)-3-methyl-but-1-enyl)-1H-quinolin-2-one

4-hydroxy-N-methyl-3-(3-methylbut-3-enyl)quinolin-2(1H)-one