You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-acetyl-2-[amino(1H-indol-3-yl)methyl]-N-[(2-ethylphenyl)methyl]-3-oxo-2-(4-piperidin-1-ylpiperidin-1-yl)butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C34H45N5O3
assistant