Nrf2 activator-9 (compound D-36) is an Nrf2 activator that inhibits oxidized low-density lipoprotein (oxLDL) and high glucose (HG)-induced apoptosis in HUVEC cells. Nrf2 activator-9 inhibits oxLDL and HG-induced vascular endothelial cell (VEC) injury and can effectively prevent and treat atherosclerosis.