You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name phenacyl (2S)-1-[(2S)-2-[[(2S)-2-[(2-methylpropan-2-yl)oxycarbonylamino]-3-phenylpropanoyl]amino]-5-oxo-5-phenylmethoxypentanoyl]pyrrolidine-2-carboxylate into its molecular formula.
user
C39H45N3O9
assistant