You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2S)-3-[acetyl-[4-hydroxy-5-[3-[(6-methoxy-1H-benzimidazol-2-yl)amino]propyl]-2-oxo-1H-imidazol-3-yl]amino]-2-(phenylmethoxycarbonylamino)propanoic acid into molecular formula.
user
C27H31N7O8
assistant