cis-5,6,12,13-tetrahydro-2,3-dimethoxy-6-methyl-5,11-dioxo-8,9-(methylenedioxy)-(11H)indeno<1,2-c>isoquinoline

(4S)-3-(1,3-benzodioxol-5-yl)-6,7-dimethoxy-2-methyl-1-oxo-3,4-dihydroisoquinoline-4-carboxylic acid

6,7-dimethoxy-3-(3',4'-methylenedioxyphenyl)-4-carboxy-N-methyl-1(2H)-isoquinolone

6,7-dimethoxy-4-methoxycarbonyl-N-methyl-3-(3',4'-methylenedioxyphenyl)-1-(2H)-isoquinolone

6,7-dimethoxy-4H-isochromene-1,3-dione