You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [(S)-[(2R,4R,5R)-5-ethenyl-1-azabicyclo[2.2.2]octan-2-yl]-(6-methoxyquinolin-4-yl)methyl] 4-chlorobenzoate by IUPAC nomenclature, provide its molecular formula.
user
C27H27ClN2O3
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