You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl N-[3-(methylcarbamoyl)-5-oxo-1,2,3,6,7,8,9,9a-octahydropyrrolo[1,2-a]azepin-6-yl]carbamate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H21N3O4
assistant