Get C8 H20 B10 N4 = 34b = 2,4-diamino-5-(1-o-carboranylmethyl)-6- methylpyrimidine Get C8 H20 B9 N4 = 39b = (s)-2,4-diamino-5-((7,8-dicarbaundecaboran-7-yl) methyl)-6-methylpyrimidine Get C8 H20 B9 N4 = 39e = (r)-2,4-diamino-5-((7,8-dicarbaundecaboran-7-yl) methyl)-6-methylpyrimidine