5-<1-<(tert-butyldimethylsilyl)oxy>ethyl>-4,7-dimethoxy-6-ethoxybenzofuran

6-hydroxy-4,7-dimethoxy-5-acetoacetylbenzofuran

4,7-dimethoxy-6-ethoxy-5-<2-(trimethylsilyl)-1-ethynyl>benzofuran

methyl 6-formyl-4,7-dimethoxy-1-benzofuran-5-carboxylate

甲醇