Monoethyl fumarate-d5 is the deuterium labeled Monoethyl fumarate (HY-W019696). Monoethyl fumarate is the monoethyl ester form of Fumaric acid (HY-W015883). Monoethyl fumarate is the activator for Nrf2. Monoethyl fumarate is a kind of effective preservative and polymerization agent for macromolecular material[1][2].