You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (2S)-2-amino-5-[[(2R)-1-(carboxymethylamino)-1-oxo-3-[2-(pyridine-3-carbonylamino)ethylsulfanyl]propan-2-yl]amino]-5-oxopentanoic acid is given. What is its corresponding molecular formula?
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C18H25N5O7S
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