3-methyl-2-oxido-1,2-benzoxazol-2-ium

4-甲基-2-氧代-2H-苯并吡喃-3-甲酸

N-hydroxy-4-methyl-2-oxochromene-3-carboxamide

2-(1-氨基乙基 )苯酚

6-[[1-(2-hydroxyphenyl)ethylamino]methylidene]cyclohexa-2,4-dien-1-one