| abstract |
A cephalosporin derivative represented by the formulan wherein R¹ is a hydrogen atom or a protecting group of the amino group, R² is a hydrogen atom or a protecting group of the hydroxyl group, R³ is a hydrogen atom or a protecting group of the carboxyl group, X is a halogen atom, a cyano group, a vinyl group, a lower alkoxy group having 1 to 4 carbon atoms or a lower alkylthio group having 1 to 4 carbon atoms and n is an integer of 1 to 3, and a non-toxic salt thereof are useful as antibacterial agents for oral administration. |