Crawforth, James; Goodacre, Simon; Maxey, Robert; Bourrain, Sylvie; Patel, Smita; Marwood, Rosemarie; O'Connor, Desmond; Herbert, Richard; Hutson, Peter; Rowley, Michael Bioorganic and Medicinal Chemistry Letters, 2000 , vol. 10, # 24 p. 2701 - 2703