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Zoute, Ludivine; Kociok-Köhn, Gabriele; Frost, Christopher G. . (2009). Rhodium-Catalyzed 1,4-Additions to Enantiopure Acceptors: Asymmetric Synthesis of Functionalized Pyrrolizidinones. Organic Letters, 11(12), 2491–2494. doi:10.1021/ol900843a 
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