2,3-bis(carbomethoxy)-5-methoxy-1,4-benzoquinone
dimethyl 1,4-dihydroxy-6-methoxy-5,8-bis(phenylmethoxy)-2,3-naphthalenedicarboxylate
3'-(diethoxymethyl)-3-hydroxy-1',6-dimethoxy-9'-(methoxymethoxy)-4,5,8,9-tetrakis(phenylmethoxy)spiro<2H-benz
3-<3-(diethoxymethyl)-1-methoxy-9-(methoxymethoxy)-8H-cyclopent
3'-(diethoxymethyl)-1',6-dimethoxy-9'-(methoxymethoxy)-4,5,8,9-tetrakis(phenylmethoxy)spiro<2H-benz