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Stark LM, Lin XF, Flippin LA. Total synthesis of Amaryllidaceae pyrrolophenanthridinium alkaloids via the Ziegler-Ullmann reaction: tortuosine, criasbetaine, and ungeremine. J Org Chem. 2000 May 19;65(10):3227–30. doi: 10.1021/jo991902p. PMID: 10814221. |