Procopiou, Panayiotis A.; Cox, Brian; Kirk, Barrie E.; Lester, Michael G.; McCarthy, Alun D.; Sareen, Meenu; Sharratt, Peter J.; Snowden, Michael A.; Spooner, Stephen J.; Watson, Nigel S.; Widdowson, Julia Journal of Medicinal Chemistry, 1996, vol. 39, # 7 p. 1413 - 1422 doi: 10.1021/jm950893j