Compounds of formula (I) ##STR1## in which R.sub.1 is A-N(O)R'R" and R.sub.2, R.sub.3 and R.sub.4 are each separately selected from hydrogen, X and NH-A-N(O)R'R" wherein X is hydroxy, halogeno, amino, C.sub.1-4 alkoxy or C.sub.2-18 alkanoyloxy, A is a C.sub.2-4 alkylene group with a chain length between N or NH and N(O)R'R" of at least 2 carbon atoms and R' and R" are each separately selected from C.sub.1-4 alkyl groups and C.sub.2-4 hydroxyalkyl and C.sub.3-4 dihydroxyalkyl groups in which the carbon atom attached to the nitrogen atom does not carry a hydroxy group and no carbon atom is substituted by two hydroxy groups, or R' and R" together are a C.sub.2-6 alkylene group which with the nitrogen atom to which R' and R" are attached forms a heterocyclic group having 3 to 7 atoms in the ring, and physiologically acceptable salts thereof are of value in the treatment of anaerobic bacterial infections.
式(I)的化合物##STR1##其中R.sub.1为A-N(O)R'R",R.sub.2、R.sub.3和R.sub.4分别选自氢、X和NH-A-N(O)R'R",其中X为羟基、卤素基、
氨基、C.sub.1-4烷氧基或C.sub.2-18脂肪酰氧基,A为链长在N或NH和N(O)R'R"之间的C.sub.2-4烷基,至少含有2个碳原子,R'和R"分别选自C.sub.1-4烷基、C.sub.2-4羟基烷基和C.sub.3-4二羟基烷基,其中连接氮原子的碳原子不带有羟基,且没有碳原子被两个羟基取代,或者R'和R"一起是C.sub.2-6烷基,与R'和R"附着的氮原子形成具有3到7个原子的环的杂环基团,其生理上可接受的盐对于治疗厌氧菌感染具有价值。