You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-[[4-amino-2-[[2-amino-3-(1H-imidazol-5-yl)propanoyl]amino]-4-oxobutanoyl]amino]propanoylamino]-3-hydroxybutanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H27N7O7
assistant