You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-amino-2-[[5-amino-2-[2-(2,6-diaminohexanoylamino)propanoylamino]-5-oxopentanoyl]amino]-4-oxobutanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H33N7O7
assistant