You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2,3-dimethylphenyl) 4-[1-(4-fluoro-N-formylanilino)-3-methylbutyl]piperidine-1-carboxylate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H33FN2O3
assistant