CEPHEM COMPOUNDS

摘要

Novel cephem compounds represented by general formula (I), wherein R1 represents an optionally protected amino group, R2 represents hydrogen or halogen, R3 represents hydrogen or an optionally substituted hydrocarbon residue, R4 represents hydrogen or methoxy, A represents an optionally substituted thiazol-3-yl group forming a fused ring at positions 4 and 5 and n represents 0 or 1. They possess an excellent antibacterial activity.