ethyl 2-(1-hydroxy-2,6-dimethoxy-4-oxocyclohexa-2,5-dien-1-yl)-2-methoxyacetate

2,3-dimethoxy-1,6-dihydroxybenzene

2,5-dimethoxybenzene-1,3-diol

重氮甲烷

2,3,5-Trimethoxy-phenol