You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-amino-N-[2-(3,5-dimethoxyanilino)-2-oxoethyl]-3,3-dimethylbutanamide;hydrochloride The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H26ClN3O4
assistant