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Zheng YR, Wang M, Kobayashi S, Stang PJ.Zheng YR, et al.Tetrahedron Lett. 2011 Apr 27;52(17):2188-2191. doi: 10.1016/j.tetlet.2010.11.119.Tetrahedron Lett. 2011.PMID: 21516167Free PMC article.