... Ther. 1981, 14, 197. 0022-2623/84/1827-1634$01.50/0 0 1984 American Chemical Society Page 2. Nitropyrazines Scheme I1 Journal of Medicinal Chemistry, 1984, Vol. 27, No. 12 1635 more complicated and is outlined in Scheme 11. Recently, Taylor et al. ...