20041-64-9

3-Ethoxy-5,6-dibromosalicylaldehyde is an IRE1/ERN1 inhibitor, with an IC₅₀ of 0.12 μM, a K_i of 71-88 nM, and a K_d of 100 nM against the ribonuclease activity of hIRE1α, as well as an IC₅₀ of 4.8 μM against yeast Ire1. It shows selectivity toward IRE1 ribonuclease. 3-Ethoxy-5,6-dibromosalicylaldehyde blocks the IRE1/ERN1-mediated unfolded protein response (UPR) signaling pathway, including XBP-1 mRNA splicing, induction of XBP1 target genes, and activation of MAPK8/9/10, but does not alter the phosphorylation level of IRE1α or the PERK/ATF6 pathway. 3-Ethoxy-5,6-dibromosalicylaldehyde inhibits chikungunya virus replication, induces growth arrest, apoptosis and clonogenic inhibition in pancreatic cancer cells, reduces FB1 (Fumonisin B1) (HY-N6719)-induced autophagy and cell death, regulates PGG-induced senescence and apoptosis, and alleviates Sorafenib (HY-10201)-induced vacuolization and damage in hepatic stellate cells. 3-Ethoxy-5,6-dibromosalicylaldehyde can be used in research related to chikungunya virus infection, pancreatic cancer, FB1-induced nephrotoxicity, liver cancer, breast cancer, lung cancer and liver fibrosis .