You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (2S)-3-acetyl-2-(4-chlorophenyl)-4-hydroxy-1-(3-methoxyphenyl)-2H-pyrrol-5-one is given. What is its corresponding molecular formula?
user
C19H16ClNO4
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