“…It is well known that there are some obstacles in drug discovery, such as target selection, initial hit identification, lead optimization and efficacies [ 13 , 14 ]. Hit to lead is a critical step in drug discovery and the hits can be achieved from following strategies such as high throughput screening (HTS) [ 15 ], fragment identification [ 16 , 17 ], structure-based drug design [ 18 , 19 , 20 ], artificial intelligence-based drug design [ 21 ], known compounds from the published literature [ 22 ], the repurposing of approved drugs [ 10 , 23 ] and DNA-encoded library screening [ 24 , 25 , 26 ]. Biochemical and cell-based assays are able to evaluate the activity of the identified hits while pan-assay interference compounds (PAINS) may give false positive results in the assay [ 27 , 28 ].…”