You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2S)-1-(dimethylamino)-3,3-dimethylbutan-2-yl]-2-[1-methyl-3-[(1-phenylethylideneamino)methyl]azepan-3-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H44N4O
assistant