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INTERMUNE, INC. BUCKMAN, Brad, O. NICHOLAS, John, B. EMAYAN, Kumaraswamy SEIWERT, Scott, D. Patent: WO2013/25733 A1, 2013 Location in patent: Paragraph 0585
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Burger Mosettig Journal of the American Chemical Society, 1935 , vol. 57, p. 2731 Journal of the American Chemical Society, 1936 , vol. 58, p. 1857,1860