You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[2-[benzyl(propan-2-yl)amino]ethyl]-2-(2-chlorophenyl)-4-piperidin-1-ylbutanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C27H38ClN3O
assistant