Sodium 2,2',2'',2'''-(((ethane-1,2-diylbis(oxy))bis(2,1-phenylene))bis(azanetriyl))tetraacetate

This compound is a tetrasodium salt form of a polyaminocarboxylate chelator, designed as a high-affinity probe for binding intracellular calcium ions. It is commonly used in cell biology research to buffer or detect changes in free calcium concentrations within living cells.