9-acetyl-4-methyl-pyrano[2,3-f]chromene-2,8-dione

8-imino-4-methyl-2-oxo-2H,8H-pyrano[2,3-f]chromene-9-carbonitrile

3-[8-{7-((p-methyl benzyl)oxy)-4-methyl}coumarinyl]sydnone

7-acetoxy-4-methyl-8-nitro-coumarin

(E)-8-[3-(2,3-dimethoxyphenyl)acryloyl]-7-hydroxy-4-methyl-2H-chromen-2-one