(1S,2S,3R,4S)-1-(3,4-Dimethoxy-phenyl)-4-hydroxy-6,7-dimethoxy-1,2,3,4-tetrahydro-naphthalene-2,3-dicarboxylic acid bis-((R)-methoxycarbonyl-phenyl-methyl) ester

(1S,2S)-1-(3,4-Dimethoxy-phenyl)-6,7-dimethoxy-1,2-dihydro-naphthalene-2,3-dicarboxylic acid 3-methyl ester

3-carbomethoxy-6,7-dimethoxy-1-(1,2-cis)-(3',4'-dimethoxyphenyl)-1,2,3,4-tetrahydronaphthalene-(2,3-cis)-2-carboxylic acid