You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[[1-carboxy-2-(1H-imidazol-5-yl)ethyl]amino]-4-[[4-methylsulfanyl-2-(pyrrolidine-2-carbonylamino)butanoyl]amino]-5-oxopentanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H32N6O7S
assistant