ethyl 2-[(1E,3E)-4-(3,5-dimethoxy-4-methoxymethoxyphenyl)-1,3-butadienyl]-6-oxo-6H-pyrano[2,3-e]benzoxazole-8-carboxylate

2-[(1E,3E)-4-(3-methoxy-4-methoxymethoxyphenyl)-1,3-butadienyl]-6-oxo-6H-pyrano[2,3-e]benzoxazole-8-carboxamide

ethyl 2-chloromethyl-6-oxo-6H-pyrano[2,3-e]benzoxazole-8-carboxylate

ethyl 2-diethoxyphosphorylmethyl-6-oxo-6H-pyrano[2,3-e]benzoxazole-8-carboxylate

ethyl 2-[(E)-2-(3-methoxy-4-methoxymethoxyphenyl)ethenyl]-6-oxo-6H-pyrano[2,3-e]benzoxazole-8-carboxylate