| 摘要 |
Compounds of the formula <IMAGE> in which R1 is hydroxyl or protected hydroxyl, R2 is carboxyl or functionally modified carboxyl, R3 is amino, amino substituted by lower alkyl, lower alkanoylamino, substituted methyleneamino or protected amino, R4 is methyl or ethyl which is optionally substituted by amino, by amino substituted by lower alkyl, substituted methyleneamino, protected amino, hydroxyl or protected hydroxyl, and m is an integer from 1 to 3, optical isomers of compounds of the formula I, mixtures of such optical isomers and salts of such compounds of the formula I which have a salt-forming group, have antibiotic properties. The compounds can be used, for example, in the form of products with antibiotic activity for the treatment of infectious diseases. |
