Task: Answer the following question about the molecule with 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+].
Request: Please describe this drug.
Result: An iron chelating agent with properties like EDETIC ACID. DTPA has also been used as a chelator for other metals, such as plutonium.
Task: Answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {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.