Fungicidal compounds having the formula (I): ##STR1## in which any two of K, L and M are nitrogen and the other is CH; and X is an optionally substituted 3- to 6-membered heterocyclic ring containing at least one trivalent nitrogen atom by which it is attached to the central pyrimidine ring.
                            具有以下结构式(I)的杀真菌化合物:##STR1## 其中K、L和M中的任意两个是氮,另一个是CH;X是一个可选择地取代的3至6元杂环,至少含有一个三价氮原子,通过这个原子与中心
嘧啶环相连。