ProdrugsEstersDrug StabilityBiotransformationDrug Delivery SystemsMolecular StructureDrug DesignAniline MustardAmpyroneFloxuridineAcyclovirCaco-2 CellsHydrolysisNucleosidesOrganophosphonatesgamma-Glutamyl HydrolaseAntineoplastic AgentsSulfadimethoxineDipeptidesAntiviral AgentsDrug Screening Assays, AntitumorChemistry Techniques, SyntheticBiopharmaceuticsSolubilitySulfamerazineChromatography, High Pressure LiquidCell Line, TumorInhibitory Concentration 50Cytosine DeaminaseAdenineDrug CarriersCell SurvivalStructure-Activity RelationshipBiological AvailabilityNitroreductasesPhosphoramide MustardsCarboxylesteraseCarboxylic Ester HydrolasesPhosphoric AcidsBacterial ToxinsPharmaceutic Aids