You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-[[3-(1H-imidazol-5-yl)-2-[[1-(pyrrolidine-2-carbonyl)pyrrolidine-2-carbonyl]amino]propanoyl]amino]butanedioic acid into its molecular formula.
user
C20H28N6O7
assistant