David J. Dale, John Draper, Peter J. Dunn, Michael L. Hughes, Farhat Hussain, Philip C. Levett,* Gordon B. Ward, and Albert S. Wood; The Process Development of a Scaleable Route to the PDE5 Inhibitor UK-357,903; Org. Proc. Res. Dev., 2002, 6 (6), pp 767–772;
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http://dx.doi.org/10.1021/op0200468