You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-[[6-amino-2-[[2-amino-3-(4-hydroxyphenyl)propanoyl]amino]hexanoyl]amino]-3-hydroxypropanoyl]amino]-3-hydroxypropanoic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H33N5O8
assistant