ThiophenesFuransEchinops PlantAnisolesCyclizationMolecular StructureChemistry Techniques, SyntheticHeterocyclic CompoundsPalladiumSulfur CompoundsStructure-Activity RelationshipCombinatorial Chemistry TechniquesStereoisomerismBenzofuransDioxinsFuraldehydeCycloaddition ReactionCatalysisOxidation-ReductionAldehydesModels, MolecularNitrofuransBenzamidinesPolychlorinated BiphenylsAntineoplastic Agents