Phosphinic AcidsSodium OxybateGABA-B Receptor AgonistsReceptors, GABA-BBenzocycloheptenesGABA-B Receptor AntagonistsBaclofenOrganophosphorus CompoundsGABA AgonistsGABA AntagonistsPhosphinesMatrix Metalloproteinase InhibitorsMetalloendopeptidasesProtease InhibitorsOligopeptidesStructure-Activity Relationship