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St. John, Sarah E. Jensen, Katherine C. Kang, Soosung Chen, Yafang Calamini, Barbara Mesecar, Andrew D. Lipton, Mark A. Bioorganic and Medicinal Chemistry, 2013 , vol. 21, # 19 p. 6022 - 6037
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Sargent, Melvyn V. Stanojevic, Edi Journal of the Chemical Society, Perkin Transactions 1: Organic and Bio-Organic Chemistry (1972-1999), 1984 , # 8 p. 1919 - 1921