2-ethyl 8-methyl 6,9-dihydro-4,6-dioxo-10-propyl-4H-pyrano[3,2-g]quinoline-2,8-dicarboxylate

ethyl 7-amino-4-oxo-8-propyl-4H-1-benzopyran-2-carboxylate

(Z)-dimethyl N-<2-(ethoxycarbonyl)-4-oxo-8-propyl-4H-1-benzopyran-7-yl>-2-amino-2-butene-1,4-dioate

N-(4-acetyl-3-hydroxy-2-propylphenyl)acetamide