You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by ethyl (E,4S)-4-[[3,3-dimethyl-2-[[2-methyl-2-(methylamino)-3-phenylpropanoyl]amino]butanoyl]-methylamino]-2,5-dimethylhex-2-enoate ?
user
C28H45N3O4
assistant