You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-[2-[(2,4-diamino-4-oxobutanoyl)amino]propanoylamino]-3-(1H-imidazol-5-yl)propanoyl]amino]-4-methylsulfanylbutanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H29N7O6S
assistant