Novel pteridines of formula (I), ##SPC1## wherein R is an optionally substituted phenoxyalkyl group, and R.sup.1 and R.sup.2 are the same or different and each is a lower alkyl group or R.sup.1 and R.sup.2, together with the carbon atom in the pteridine ring structure, form a spirocycloalkyl ring system having 4 to 6 carbon atoms outside the pteridine ring structure, And their method of preparation. The above compounds have bacteriostatic activity.
化合物(I)是一种新型的黄素类衍
生物,其中R是一个可选取的取代的苯氧基烷基,而R.sup.1和R.sup.2相同或不同,每个都是较低的烷基,或者R.sup.1和R.sup.2与黄素环结构中的碳原子一起形成一个螺环烷基环系统,其在黄素环结构外有4到6个碳原子。这些化合物的制备方法也给出了。上述化合物具有抑菌活性。