JUN and gastric cancer: This study, through network pharmacology and protein‐molecule docking technology, screened and discovered that luteolin, quercetin, kaempferol, and (+)‐catechin in Hairyvein Agrimonia can inhibit the gastric cancer cell lines AGS and HGC‐27, and the main targets of these active components include oncogenic proteins such as JUN, HIF1A, and PTGS2.