Described are compounds of formula I ##STR1## wherein R.sub.1 is hydrogen or hydroxy; R.sub.2, R.sub.2 ' and R.sub.2 " are each independently of the others hydrogen or a substituent other than hydrogen; either R.sub.3 is hydrogen or a substituent other than hydrogen and R.sub.4 is hydrogen or lower alkyl, or R.sub.3 and R.sub.4 together form a divalent radical of the formula --(CH.sub.2).sub.n -- wherein n is 2 or 3; R.sub.5 and R.sub.6 are each independently of the other hydrogen, alkyl or aryl; and either R.sub.7 and R.sub.8 are each hydrogen, or R.sub.7 and R.sub.8 together form a bond; tautomers thereof, provided that at least one tautomerisable group is present; and salts thereof. The compounds inhibit the enzyme S-adenosylmethionine decarboxylase and are suitable, for example, for the treatment of tumours and protozoal infections.
描述的是式I的化合物##STR1##其中R.sub.1是氢或羟基;R.sub.2、R.sub.2'和R.sub.2"各自独立地是氢或除氢以外的取代基;R.sub.3要么是氢要么是除氢以外的取代基,而R.sub.4是氢或较低的烷基,或者R.sub.3和R.sub.4一起形成式--(CH.sub.2).sub.n--的二价基团,其中n为2或3;R.sub.5和R.sub.6各自独立地是氢、烷基或芳基;而R.sub.7和R.sub.8要么各自是氢,要么R.sub.7和R.sub.8一起形成键;其互变异构体,只要至少存在一个互变异构基团;以及其盐。这些化合物抑制S-
腺苷甲
硫氨酸脱羧酶酶,并适用于例如治疗肿瘤和原虫感染。