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

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

2,7-dioxo-2,3-dihydro-1H,7H-chromeno[7,8-b][1,4]oxazine-9-carboxylic acid ethyl ester