Namely
Trisodium Ethylenediamine Disuccinate is a structural isomer of EDTA: overall, it is the same formula, but in which the atoms are placed in a different order. The ingredient is used as EDTA as a chelating agent, that is, it forms complexes with metal ions that may affect the stability and / or appearance of cosmetic products.
The big difference from EDTA is that this molecule is biodegradable