KRAS G12C inhibitor 47 (compound 8-1-1) is a potent KRAS G12C inhibitor with an IC50 of 0.172 µM. KRAS G12C inhibitor 47 shows p-ERK inhibition activities with IC50s of 0.046, 69.8 µM in MIA PaCA-2, A549 cells, respectively. KRAS G12C inhibitor 47 has the potential for the research of pancreatic, colorectal, and lung cancers[1].