Heterocyclic CompoundsAza CompoundsHeterocyclic Compounds, Bridged-RingNitrogen CompoundsCyclizationHeterocyclic Compounds, 2-RingPalladiumMolecular StructureHeterocyclic Compounds with 4 or More RingsHeterocyclic Compounds, 3-RingHeterocyclic Compounds, 1-RingMagnetic Resonance SpectroscopyAzathioprineAzacitidineSulfur CompoundsVolatile Organic CompoundsStructure-Activity RelationshipSpiro CompoundsPlant ExtractsDrug Evaluation, PreclinicalSmall Molecule Libraries