You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 4-methyl-3-[2-oxo-2-[(2S)-2-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)pyrrolidin-1-yl]ethyl]-1,3-thiazol-2-one by IUPAC nomenclature, provide its molecular formula.
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C17H23N5O2S
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