You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(3-benzylsulfanyl-2-oxopropyl)-2-[2-oxo-3-(thiophen-2-ylmethylamino)pyrazin-1-yl]butanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H26N4O3S2
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