The role of ligand efficiency metrics in drug discovery

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A Role for Fragment-Based Drug Design in Developing Novel Lead Compounds for Central Nervous System Targets (2015, background): “Another concept that has been reviewed recently is ligand efficiency, which tries to quantify the binding energy contribution of a ligand on a per atom basis (32).”
Rethinking drug design in the artificial intelligence era (2019, background): “In their efforts to keep up with the size, complexity and dimensionality of drug discovery projects (and to translate their findings into designs for new compounds), scientists often resort to simple heuristics and efficiency metrics 118–120 .”
Twenty years on: the impact of fragments on drug discovery (2016, background): “Basic principles of FBDD include emphasis on highly quality-controlled chemical libraries, bio-physical validation of protein–ligand interactions, hit optimization aided by structural biology and hit assessment by ligand efficiency 22,64 .”