You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[[1-[(3-amino-1-carboxy-3-oxopropyl)amino]-3-methyl-1-oxobutan-2-yl]amino]-4-[(2-amino-3-hydroxybutanoyl)amino]-5-oxopentanoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H31N5O9
assistant