You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule methyl 3-[5-(5-methyl-1-pyridin-3-ylpyrrol-2-yl)-4-pyridin-2-yl-2-sulfanylideneimidazolidin-1-yl]propanoate ?
user
C22H23N5O2S
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