N-oxides of benyzlpyrimidines of the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3 are as set forth hereinafter, ARE DESCRIBED. The 2,4-diamino-5-(4-bromo-3,5-dimethoxybenzyl)-pyrimidine is also described. The compounds referred to above are useful as potentiators of the antibacterial activity of sulfonamides.
                            本文介绍了式子##STR1##中R.sup.1、R.sup.2和R.sup.3如下所述的苄基
嘧啶的N-氧化物。还描述了2,4-二
氨基-5-(4-
溴-3,5-二甲氧基苄基)
嘧啶。上述化合物可用作磺
胺类抗菌药物活性的增强剂。