Nucleoside Natural Product Antibiotics Targetting Microbial Cell Wall Biosynthesis.- The Cyclic Lipopeptide Antibiotics.- Fully Synthetic Tetracyclines: Increasing Chemical Diversity to Combat Multidrug-Resistant Bacterial Infections.- The Antifolates.- The Oxazolidinones.- Sideromycins as Pathogen-Targeted Antibiotics.- Quorum Sensing Inhibitors as Pathoblockers for Pseudomonas aeruginosa Infections: A New Concept in Anti-Infective Drug Discovery.