User: I'm looking for the SMILES of a molecule that can be described as:
The molecule is an amino acid zwitterion of homocysteine arising from transfer of a proton from the carboxy to the amino group; major species at pH 7.3. It has a role as a human metabolite, an Escherichia coli metabolite and a Saccharomyces cerevisiae metabolite. It is a tautomer of a homocysteine.
Assistant: This is a molecule that fits your description: [NH3+]C(CCS)C(=O)[O-]
User: I'm {#searching|looking!} for the {SMILES__description} of a molecule that can be described {#by|as!}:
{description#}
Assistant: This is a molecule that fits {#your|this!} description: {SMILES#}
2-azaniumyl-4-sulfanylbutanoate
The molecule is an amino acid zwitterion of homocysteine arising from transfer of a proton from the carboxy to the amino group; major species at pH 7.3. It has a role as a human metabolite, an Escherichia coli metabolite and a Saccharomyces cerevisiae metabolite. It is a tautomer of a homocysteine.