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EIF2α Activator 1 (Compound 40) is a chemical compound that activates the phosphorylation of eukaryotic initiation factor 2 alpha (eIF2α), enhancing the expression of downstream proteins ATF and CHOP. It demonstrates antiproliferative effects against K562 and PBMC cells, with IC50 values of 4.00 and 19.3 μM, respectively [1].