Magnetic Resonance SpectroscopyMolecular StructureSpectrometry, Mass, Fast Atom BombardmentStreptomycesFermentationSpectrophotometry, InfraredOptical RotationPhysicochemical PhenomenaChemistry, PhysicalMolecular ConformationLactonesChemistryChemical PhenomenaPyransPeptides, CyclicPenicilliumMass SpectrometryAnti-Bacterial AgentsGlycosidesCoccidiostatsSpectrophotometry, UltravioletStereoisomerismMacrolidesSpiro CompoundsBile PigmentsPaecilomycesDepsipeptidesChaetomiumChromatography, High Pressure LiquidFuransGas Chromatography-Mass SpectrometryMitosporic FungiNuclear Magnetic Resonance, BiomolecularHypocrealesPoriferaNocardiaceaeAntibiotics, AntineoplasticAntifungal AgentsAnthraquinonesStructure-Activity RelationshipPlant ExtractsAminoglycosidesPyronesXylarialesStreptomycetaceaeActinomycetalesChromatography, Thin LayerSpectrometry, Mass, Electrospray IonizationChlortetracyclineDrug Screening Assays, AntitumorBiological ProductsDiterpenesCoumarinsSesquiterpenesMacrocyclic CompoundsMadagascarTriterpenesNaphthoquinonesSpectrum AnalysisCitrobacterEpoxy CompoundsHexosesAspergillusPolyenesHydrolysisAmino AcidsCrystallography, X-RayMolecular Sequence DataPeptidesLactamsGram-Positive BacteriaSterol O-AcyltransferaseFungiEnzyme InhibitorsNocardiaMicrobial Sensitivity TestsIndolesCarbohydrate SequenceModels, MolecularCarbohydrate ConformationAmino Acid SequenceThiazolesMethylationX-Ray DiffractionTandem Mass SpectrometryBacteriaAntineoplastic AgentsBacillusOligosaccharidesOligopeptidesSulfur CompoundsVolatile Organic CompoundsDrug Evaluation, PreclinicalPhenolsMolecular WeightHeterocyclic CompoundsInhibitory Concentration 50Small Molecule LibrariesSulfhydryl CompoundsKinetics