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3-[6,7-Dimethoxy-1-(3,4,5-trimethoxy-benzyl)-3,4-dihydro-1H-isoquinolin-2-yl]-propionic acid 2-{3-[6,7-dimethoxy-1-(3,4,5-trimethoxy-benzyl)-3,4-dihydro-1H-isoquinolin-2-yl]-propionyloxy}-ethyl ester; compound with oxalic acid