Linear Formula: (-CH2OCH2CH2N(CH2CO2H)2)2, Molecular Weight: 380.35, for molecular biology, ≥97.0%, Synonym: EGTA, Egtazic acid, Ethylene-bis(oxyethylenenitrilo)tetraacetic acid, Glycol ether diamine tetraacetic acid. A chelating agent useful for the determination of calcium in the presence of magnesium.