User: I'm looking for the SMILES of a molecule that can be described as:
The molecule is the stable isotope of europium with relative atomic mass 150.919846, 47.8 atom percent natural abundance and nuclear spin 5/2.
Assistant: This is a molecule that fits this description: [151Eu]
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#}
europium-151
The molecule is the stable isotope of europium with relative atomic mass 150.919846, 47.8 atom percent natural abundance and nuclear spin 5/2.