... 5 0 0 0 0 1- 6 1- r 8 I 9 (13) Hadley, M. S. in "The Chemical Regulation of Biological Mechanisms", Creighton, AM; Turner, S., Eds.; Royal Soci- ety of Chemistry: London, 1982; pp 140-153. Journal of Medicinal Chemistry, 1989, Vol. 32, No. 4 875 Scheme I ...