You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-[(3-ethoxy-4-methoxyphenyl)methyl]-5-(2-fluorophenyl)-3-propan-2-ylbenzimidazol-2-one by IUPAC nomenclature, provide its molecular formula.
user
C26H27FN2O3
assistant