Porter, John R.; Archibald, Sarah C.; Brown, Julien A.; Childs, Kirstie; Critchley, David; Head, John C.; Parton, Ted A. H.; Robinson, Martyn K.; Shock, Anthony; Taylor, Richard J.; Warrellow, Graham J. Bioorganic and Medicinal Chemistry Letters, 2003, vol. 13, # 5 p. 805 - 808 doi: 10.1016/S0960-894X(03)00019-2