LactamsCyclizationalpha-MSHHeterocyclic Compounds, 1-Ringbeta-LactamsMuramic AcidsStereoisomerismCyclacillinMolecular StructureAminationCleomeReceptors, MelanocortinIminesStreptothricinsSuperinfectionAnti-Bacterial AgentsAlkenesCarboxylic AcidsStreptomycesAmidesMagnetic Resonance SpectroscopyDrug DesignAminoglycosidesStructure-Activity RelationshipPeptides, CyclicChromatography, PaperAza CompoundsBicyclo Compounds, HeterocyclicIndium Radioisotopes