You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2S)-1-[2-acetylsulfanyl-4-(1-benzofuran-3-yl)-4-oxobutanoyl]pyrrolidine-2-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C19H19NO6S
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