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-amino-4-[[1-[[1-[(1-carboxy-2-hydroxyethyl)amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-4-oxobutanoic acid .
user
C21H27N5O9
assistant