You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 5-[5-(4-chlorophenyl)pyridin-2-yl]-N-[(1S)-1-cyclohexylethyl]-1-methylbenzimidazol-2-amine by IUPAC nomenclature, provide its molecular formula.
user
C27H29ClN4
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