Question: Please describe this drug.
Constraint: The Molecule can be represented with the SMILES O=C([O-])C[NH+](CC[NH+](CC(=O)[O-])CC(=O)[O-])CC[NH+](CC(=O)[O-])CC(=O)[O-].[Ca+2].[Na+].[Na+].[Na+].
Answer: An iron chelating agent with properties like EDETIC ACID. DTPA has also been used as a chelator for other metals, such as plutonium.
{#Question|Q!}: {quest#}
{#Constraint:|Description:|!} The {#Molecule|Compound|Chemical!} {#has the|can be represented with the!} {SMILES__description} {SMILES#}.
{#Answer|Result|Answer!}: {answ#}
O=C([O-])C[NH+](CC[NH+](CC(=O)[O-])CC(=O)[O-])CC[NH+](CC(=O)[O-])CC(=O)[O-].[Ca+2].[Na+].[Na+].[Na+]
C(C[NH+](CC(=O)[O-])CC(=O)[O-])[NH+](CC[NH+](CC(=O)[O-])CC(=O)[O-])CC(=O)[O-].[Na+].[Na+].[Na+].[Ca+2]
calcium;trisodium;2-[bis[2-[bis(carboxylatomethyl)azaniumyl]ethyl]azaniumyl]acetate
Please describe this drug.