You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-1-[(2S)-2-[(2-sulfanylidene-1H-pyridine-4-carbonyl)amino]propanoyl]pyrrolidine-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C14H17N3O4S
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