benzene-1,2,3,4-tetrol

7,8-dihydroxy-3-(4-methoxyphenyl)chromen-4-one

3-methoxy-5-prop-2-enylbenzene-1,2-diol

4,6-二叔丁基邻苯三酚

7,8-dimethoxy-2-oxochromene-4-carbaldehyde