You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[(4-chloro-2-fluorophenyl)methyl]-3-ethyl-N-[(1R)-1-(4-ethylsulfonylphenyl)-2-hydroxyethyl]imidazo[1,2-a]pyridine-7-carboxamide by IUPAC nomenclature, provide its molecular formula.
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C27H27ClFN3O4S
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