You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 6-amino-2-[[2-[[2-[(2-amino-3-sulfanylpropanoyl)amino]-3-hydroxypropanoyl]amino]-3-(4-hydroxyphenyl)propanoyl]amino]hexanoic acid into molecular formula.
user
C21H33N5O7S
assistant