You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name ethane;5-methoxyimino-3-(methylamino)-1-(3-oxobutan-2-yl)-3,4-dihydro-1-benzazepin-2-one ?
user
C18H27N3O3
assistant