ethylene glycol bis(2-aminoethyl)tetraacetic acid3,12-bis(carboxymethyl)-6,9-dioxa-3,12-diazatetradecanedioic acidEGTAEgtazic acidH4egta[ethylenebis(oxyethylenenitrilo)]tetraacetic acidethylene glycol bis(beta-aminoethyl ether)-N,N,N',N'-tetraacetic acidethylene glycol-O,O'-bis(2-aminoethyl)-N,N,N',N'-tetraacetic acid