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(DIMETHOXY-PH)-4-HO-5,6,7-TRIMETHOXY-NAPHTHALENE-2-CARBOXYLIC ACID TERT-BU ESTER (DIMETHOXY-PH)-4-HO-5,6,7-TRIMETHOXY-NAPHTHALENE-2-CARBOXYLIC ACID TERT-BU ESTER