You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 1-[2-(9H-fluoren-9-ylmethoxycarbonylamino)-4-methylsulfanylbutanoyl]-3-methylpiperidine-2-carboxylic acid into molecular formula.
user
C27H32N2O5S
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