VVD-214 is a synthetic lethal allosteric inhibitor of WRN helicase with an IC50 of 0.1316 µM. VVD-214 covalently binds to cysteine 727 of WRN and inhibits ATP hydrolysis and helicase activity. VVD-214 is potent in causing double-stranded DNA breaks, nuclear swelling, and cell death in high microsatellite instability (MSI) cancers[1][2].