3-[(R)-6,7-Dimethoxy-1-(3,4,5-trimethoxy-benzyl)-3,4-dihydro-1H-isoquinolin-2-yl]-2-hydroxy-propionic acid 6-{3-[(R)-6,7-dimethoxy-1-(3,4,5-trimethoxy-benzyl)-3,4-dihydro-1H-isoquinolin-2-yl]-2-hydroxy-propionyloxy}-hexyl ester
3-[1-(3,4-Dimethoxy-benzyl)-6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl]-2-hydroxy-propionic acid 6-{3-[1-(3,4-dimethoxy-benzyl)-6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl]-2-hydroxy-propionyloxy}-hexyl ester
2-Acetoxy-3-[1-(3,4-dimethoxy-benzyl)-6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl]-propionic acid 6-{2-acetoxy-3-[1-(3,4-dimethoxy-benzyl)-6,7-dimethoxy-3,4-dihydro-1H-isoquinolin-2-yl]-propionyloxy}-hexyl ester
2-Acetoxy-3-[6,7-dimethoxy-1-(3,4,5-trimethoxy-benzyl)-3,4-dihydro-1H-isoquinolin-2-yl]-propionic acid 6-{2-acetoxy-3-[6,7-dimethoxy-1-(3,4,5-trimethoxy-benzyl)-3,4-dihydro-1H-isoquinolin-2-yl]-propionyloxy}-hexyl ester
3-[6,7-Dimethoxy-1-(3,4,5-trimethoxy-benzyl)-3,4-dihydro-1H-isoquinolin-2-yl]-2-formyloxy-propionic acid 6-{3-[6,7-dimethoxy-1-(3,4,5-trimethoxy-benzyl)-3,4-dihydro-1H-isoquinolin-2-yl]-2-formyloxy-propionyloxy}-hexyl ester