<chemical> A pyridinium-substituted semisynthetic, broad-spectrum antibacterial used especially for pseudomonas infections in debilitated patients. ... Pharmacological action: cephalosporins. ... Chemical name: Pyridinium, 4-(aminocarbonyl)-1-((2-carboxy-8-oxo-7-((phenylsulfoacetyl)amino)-5-thia-1-azabicyclo(4.2.0)oct-2-en-3-yl)methyl)-, inne...