“…9). 200 Other representative IQA studies on molecular clusters have focused on the characterization of cooperative effects (a guanine quartet in complex with metal cations or porphyrin molecules), 201,202 the identification of preferred binding sites (the adeninate anion interacting with Na + /K + counterions), 203 and the strength of charged-assisted H-bonds. 204 The IQA scoring of key interactions between a ligand and its biological target could be particularly useful for fragment-based drug design by assessing the suitability of chemical modifications, as suggested by the recent studies on zimlovisertib, an interleukin-1 receptor-associated kinase 4 inhibitor, currently in trials for its use in patients of COVID-19 pneumonia, 205 and on two drug candidates targeting the hepatitis C virus NS5B protein.…”