Question: How many hydrogen bond acceptors are there in this compound, calculated according to Lipinski's original rules (i.e., counting N and O atoms)?
 The Molecule has the SMILES O=C([O-])CCCc1ccccc1.[Na+].
Result: 2
{#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-])CCCc1ccccc1.[Na+]
O=C([O-])CCCc1ccccc1.[Na+]
sodium;4-phenylbutanoate
How many hydrogen bond acceptors are there in this compound, calculated according to Lipinski's original rules (i.e., counting N and O atoms)?
2