5-(4-oxo-4H-chromen-3-yl)-2-phenyl-5,6-dihydro-4H,7H-pyrano[2,3-d][1,3]thiazine-4,7-dione

2-(N-methylanilino)-4-oxochromene-3-carbaldehyde

3-(1-hydroxybut-3-enyl)chromen-4-one

1H-furo[3,4-b]chromene-3,9-dione

2-(4-oxo-4H-1-benzopyran-3-yl)-4-(N-cyclohexylimino)pyrano[3,4-b]-1-benzopyran-10-one