You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
cyclobutyl-[3-[2-[2-[cyclobutyl(methyl)amino]ethyl]-1-ethylbenzimidazol-5-yl]piperidin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H38N4O
assistant