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[Studies on the alkaloids of menispermaceous plants. CCXXV. Syntheses of dauricine type bases. 2. Synthesis of 2,7-bis (2-methyl-6,7-dimethoxy-1,2,3,4-tetrahydroisoquinolin-1-ylmethyl) dibenzo-p-dioxin and its reductive cleavage by metallic sodium in liquid ammonia].
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