Novel rifamycins characterized by the following structural formula ##STR1## WHEREIN Me represents a methyl group, n represents 3, 4, 5 or 6; g represents 0, 1 or 2; and each R represents a lower alkyl group selected from methyl or ethyl substituting for a hydrogen atom of a --CH.sub.2 -- group; and wherein, when g is 2, the two lower alkyl groups may replace hydrogen atoms of two different methylene groups as well as hydrogen atoms of the same methylene group. The compounds of this invention possess a broad spectrum antibacterial utility accompanied by a low toxicity.
本发明的新型
利福霉素具有以下结构式:##STR1## 其中,Me代表甲基基团,n代表3、4、5或6;g代表0、1或2;每个R代表选择甲基或乙基取代--CH.sub.2--基上的氢原子的低碳基团;当g为2时,两个低碳基团可以取代两个不同的亚甲基基团以及同一亚甲基基团的氢原子。本发明的化合物具有广谱抗菌活性和低毒性。