You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[(2S)-2-[[(2S)-2-[[(2S)-2-amino-4-methylpentanoyl]amino]-3-(1H-indol-3-yl)propanoyl]amino]-3-hydroxypropanoyl]amino]acetic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H31N5O6
assistant