User: I'm searching for the SMILES of a molecule that can be described by:
The molecule is the stable isotope of silicon with relative atomic mass 28.9764947, 4.683 atom percent natural abundancy, and nuclear spin (1)/2.
Assistant: This is a molecule that fits this description: [29Si]
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#}
[29Si]
[29Si]
silicon-29
The molecule is the stable isotope of silicon with relative atomic mass 28.9764947, 4.683 atom percent natural abundancy, and nuclear spin (1)/2.