You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (2S)-2-[[(2S)-2-[[(2S)-2-(chloromethylamino)-5-[2-[(3R,4S,5R,6R)-2,3,4,5-tetrahydroxy-6-(hydroxymethyl)oxan-2-yl]ethylamino]pentanoyl]amino]propanoyl]amino]propanoic acid .
user
C20H37ClN4O10
assistant