3-[furan-2-yl-(4-hydroxy-2-oxochromen-3-yl)methyl]-4-hydroxychromen-2-one

4-hydroxy-3-[(4-hydroxy-2-oxochromen-3-yl)-(3,4,5-trimethoxyphenyl)methyl]chromen-2-one

4-phenylpyrano[3,2-c]chromene-2,5-dione

4-hydroxypyrano[3,2-c]chromene-2,5-dione

4-hydroxy-3-(3-oxobutyl)chromen-2-one