Egta acetoxymethyl ester

Formula : C26-H40-N2-O18
CAS : 99590-86-0 

Membrane-permeable form of EGTA.

Egta disodium

Formula : C14-H24-N2-O10.2Na
CAS : 26082-78-0 

A chelating agent relatively more specific for calcium and less toxic than EDETIC ACID.