You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-N-[5-[1-[2-(2,5-dimethylphenoxy)ethyl]benzimidazol-2-yl]pentyl]but-2-enamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H33N3O2
assistant