| 摘要 |
The acyl derivatives provided by the present invention are compounds of the general formula <IMAGE> (I) wherein R represents furyl, thienyl or phenyl optionally substituted by halogen, hydroxy, lower alkoxy or lower alkyl, R1 represents alkyl or aminocarbonylmethyl and X represents a group of the formula <IMAGE> in which one of the two symbols R2 and R3 or R4 and R5 represents hydrogen and the other represents lower alkyl, carboxymethyl or sulphomethyl, and the pharmaceutically acceptable salts of said compounds and hydrates of said salts. Also disclosed are a process for the manufacture of the compounds and pharmaceutical preparations therefor. The compounds of the present invention have antibiotic activity, especially bactericidal activity.
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