You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 5-[(2-chloro-6-fluorophenyl)methyl]-4-methyl-6-(4-methylsulfonylpiperazin-1-yl)-2-propan-2-ylpyrimidine is given. What is its corresponding molecular formula?
user
C20H26ClFN4O2S
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