You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 2-[[5-amino-2-[2-[(2-amino-4-methylsulfanylbutanoyl)amino]propanoylamino]-5-oxopentanoyl]amino]-3-(1H-imidazol-5-yl)propanoic acid .
user
C19H31N7O6S
assistant