has role independent continuant ethyl ester maleate ester diethyl maleate CHEBI:68508 A maleate ester resulting from the formal condensation of both carboxy groups of maleic acid with ethanol. A colourless liquid at room temperature (m.p. -10°C) with boiling point 220°C at 1 atm., it is commonly used as a dienophile for Diels-Alder-type cycloaddition reactions in organic synthesis. glutathione depleting agent