You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (4S)-4-[[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S)-2-amino-4-methylpentanoyl]amino]-3-hydroxypropanoyl]amino]-3-hydroxypropanoyl]amino]hexanoyl]amino]-5-oxopentanoic acid by IUPAC nomenclature, provide its molecular formula.
user
C23H41N5O9
assistant