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 (E,4S)-4-[[2-[[2-(hydroxymethyl)-4-methyl-2-(methylamino)pentanoyl]amino]-3,3-dimethylbutanoyl]-methylamino]-2,5-dimethylhex-2-enoic acid .
user
C23H43N3O5
assistant