You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2R)-2-[[(2S)-6-amino-2-[[(2S)-2-[[(2R)-2-amino-3-sulfanylpropanoyl]amino]-3-(1H-imidazol-5-yl)propanoyl]amino]hexanoyl]amino]-3-sulfanylpropanoic acid into its molecular formula.
user
C18H31N7O5S2
assistant