4-methyl-N'-(2-oxobenzofuran-3(2H)-ylidene)benzenesulfonohydrazide

2'-羟基苯乙酮

3-diazonio-1-benzofuran-2-olate

2-羟基-1-苯并呋喃-3(2H)-酮

3-羟基-1-苯并呋喃-2(3H)-酮