These are chelating agents used in hair care products.

Chelating agents are used in small amounts to react with metal ions present in hair care products or in the water, in order to improve stability or performance of the product.

Diiospropyl oxalate
Disodium EDTA
Disodium EDTA-copper
Oxalic acid
Potassium or sodium citrate
Sodium oxalate
Tetrasodium EDTA
Trisodium EDTA
Trisodium HEDTA