You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 1-[(2S)-2-amino-3-methylbutanoyl]-N-[(2S)-1-(4-ethoxyanilino)-1-oxo-3-phenylpropan-2-yl]piperidine-4-carboxamide .
user
C28H38N4O4
assistant