2-(3,4-dimethoxyphenyl)-5-hydroxy-3,6,7,8-tetramethoxychromen-4-one

2-(3,4-dimethoxyphenyl)-3,5-dihydroxy-6,7-dimethoxychromen-4-one

2-(3,4-dimethoxyphenyl)-3,6,7-trimethoxy-4-oxo-4H-chromen-5-yl 4-methylbenzenesulfonate