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-[2-[[2-[(2-amino-4-methylsulfanylbutanoyl)amino]-3-sulfanylpropanoyl]amino]propanoylamino]-3-(1H-indol-3-yl)propanoic acid .
user
C22H31N5O5S2
assistant