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-amino-3-(1H-indol-3-yl)propanoyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]-3-sulfanylpropanoyl]amino]-3-(1H-imidazol-5-yl)propanoic acid ?
user
C26H31N9O5S
assistant