You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (2S)-2-amino-3-methyl-N-[2-oxo-2-[(2-phenylsulfanylphenyl)methylamino]ethyl]butanamide;hydrochloride ?
user
C20H26ClN3O2S
assistant