Task: Please answer the following question about the molecule with SMILES O=C([O-])CN(CCN(CC(=O)[O-])CC(=O)[O-])CCN(CC(=O)[O-])CC(=O)[O-].[Ca+2].[Na+].[Na+].[Na+].
Request: How many hydrogen bond donors does this compound have?
Result: 5
Task: Please answer the following question about the molecule with {SMILES__description} {SMILES#}.
{#Description|Question|Request!}: {quest#}
{#Result|Answer|Completion!}: {answ#}
O=C([O-])CN(CCN(CC(=O)[O-])CC(=O)[O-])CCN(CC(=O)[O-])CC(=O)[O-].[Ca+2].[Na+].[Na+].[Na+]
O=C([O-])CN(CCN(CC(=O)[O-])CC(=O)[O-])CCN(CC(=O)[O-])CC(=O)[O-].[Ca+2].[Na+].[Na+].[Na+]
calcium;trisodium;2-[bis[2-[bis(carboxylatomethyl)amino]ethyl]amino]acetate
How many hydrogen bond donors does this compound have?