8-氨基-4-氧代-4H-1-苯并吡喃-2-羧酸乙酯

8-amino-2-ethoxycarbonyl-4-oxochromane

8-amino-2-ethoxycarbonyl-4-hydroxy-3,4-dihydro-2H-1-benzopyran

8-amino-2-ethoxycarbonyl-3,4-dihydro-2H-1-benzopyran

8-氨基-4-氧代-4H-苯并吡喃-2-羧酸