Heterocyclic CompoundsAza CompoundsHeterocyclic Compounds, Bridged-RingNitrogen CompoundsCyclizationHeterocyclic Compounds, 2-RingPalladiumMolecular StructureHeterocyclic Compounds with 4 or More RingsHeterocyclic Compounds, 3-RingMagnetic Resonance SpectroscopyHeterocyclic Compounds, 1-RingAzathioprineStereoisomerismFatty Acids, UnsaturatedStructure-Activity RelationshipCarbon-Carbon Double Bond IsomerasesAlkenesIsomerismMolecular ConformationAzacitidineChromatography, High Pressure LiquidFatty Acid DesaturasesOxidation-ReductionSulfur CompoundsModels, MolecularGas Chromatography-Mass SpectrometryKineticsMass SpectrometryVolatile Organic CompoundsModels, ChemicalEpoxy CompoundsMolecular Sequence DataSubstrate SpecificityChromatography, GasHydrogenationChromatography, Thin LayerHydrocarbons, CyclicFatty AcidsDisulfidesSpiro CompoundsCalendulaEstersHydrogen BondingCatalysisDose-Response Relationship, DrugSulfhydryl CompoundsPlant ExtractsCholestanesOxidoreductases Acting on CH-CH Group DonorsChemistryDrug Evaluation, PreclinicalSpectrophotometry, InfraredSpectrophotometry, UltravioletChemical PhenomenaSmall Molecule LibrariesMutationSpectrometry, Mass, Electrospray IonizationAmino Acid SequenceOrganophosphorus Compounds