dimethyl 3,4-dihydroxy-1-[2-(3,4-dimethoxyphenyl)ethyl]pyrrole-2,5-dicarboxylate

dimethyl 1-[2-(3,4-dimethoxyphenyl)ethyl]-3,4-bis(trifluoromethanesulfonyloxy)pyrrole-2,5-dicarboxylate

2-[(3,4-dimethoxyphenyl)ethynyl]-4,5-dimethoxybenzaldehyde

2-(3,4-Dimethoxy-phenylethynyl)-4,5-dimethoxy-phenol

2-[(3,4-dimethoxyphenyl)ethynyl]-4,5-dimethoxy-1-(methoxymethoxy)benzene