| abstract |
(57) [Summary] [Objective] To provide a cephem compound having a wide range of excellent antibacterial activity against Gram-positive and negative bacteria. [Configuration] formula - (CH 2) n -Y- R wherein, n represents 0 or 1, Y is S, O or formula NR 3 group (R 3 is H or optionally substituted lower alkyl group And R represents a 3,4-dioxo-1-cyclobuten-1-yl group which may have a substituent at the 2-position] and a cephem compound having a substituent at the 3-position or a salt thereof. . |