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Gunawan S, Nichol G, Hulme C.Gunawan S, et al.Tetrahedron Lett. 2012 Mar 28;53(13):1664-1667. doi: 10.1016/j.tetlet.2012.01.080. Epub 2012 Jan 28.Tetrahedron Lett. 2012.PMID: 22707799Free PMC article.
Gunawan S, Hulme C.Gunawan S, et al.Tetrahedron Lett. 2013 Aug 14;54(33):4467-4470. doi: 10.1016/j.tetlet.2013.06.042.Tetrahedron Lett. 2013.PMID: 23997316Free PMC article.