Task: Please create a SMILES based on the description below.
Description: The molecule is the stable isotope of thallium with relative atomic mass 202.9723. The least abundant (29.524 atom percent) isotope of naturally occurring thallium.
Result: [203Tl]
Task: Please {#give me|create|generate!} a {#molecule |!}{SMILES__description} based on the {#text |!}description{# below|!}.
Description: {description#}
Result: {SMILES#}
[203Tl]
thallium-203
The molecule is the stable isotope of thallium with relative atomic mass 202.9723. The least abundant (29.524 atom percent) isotope of naturally occurring thallium.