You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[[4-amino-2-(2,6-diaminohexanoylamino)-4-oxobutanoyl]amino]-4-[[1-carboxy-2-(1H-imidazol-5-yl)ethyl]amino]-4-oxobutanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H32N8O8
assistant