Photochemical ProcessesLightMolecular StructureSulfur CompoundsVolatile Organic CompoundsStructure-Activity RelationshipPlant ExtractsDrug Evaluation, PreclinicalMagnetic Resonance SpectroscopyPhenolsHeterocyclic CompoundsInhibitory Concentration 50Biphenyl CompoundsSulfhydryl CompoundsSmall Molecule LibrariesOrganotin CompoundsAniline CompoundsSpiro CompoundsNitrogen CompoundsChromatography, High Pressure LiquidStereoisomerismDrug DesignDose-Response Relationship, DrugNitroso CompoundsOrganometallic CompoundsOrganoselenium CompoundsDrug Screening Assays, Antitumor