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 3-[(2-amino-3-methylbutanoyl)amino]-4-[2-[(1-carboxy-3-methylsulfanylpropyl)carbamoyl]pyrrolidin-1-yl]-4-oxobutanoic acid .
user
C19H32N4O7S
assistant