You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 2-[[2-[[2-(2-aminopropanoylamino)-3-methylpentanoyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]-3-methylpentanoic acid ?
user
C21H36N6O5
assistant