2F9U:
reference: Novel inhibitors of hepatitis C NS3-NS4A serine protease derived from 2-aza-bicyclo[2.2.1]heptane-3-carboxylic acid., Venkatraman S, Njoroge FG, Wu W, Girijavallabhan V, Prongay AJ, Butkiewicz N, Pichardo J, Bioorg Med Chem Lett. 2006 Mar 15;16(6):1628-32. Epub 2006 Jan 18. PMID: 16413182

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