You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named (2S,4S)-N-[3-(2-methoxyphenyl)sulfanyl-2-methylpropyl]-2-methylpiperidine-4-carboxamide is given. What is its corresponding molecular formula?
user
C18H28N2O2S
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