You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[3-[(4-cyanophenyl)methyl]imidazol-4-yl]acetyl]-4-[(2-methylphenyl)methyl]piperidine-4-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H28N4O3
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