You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(4R)-1,4-dimethyl-3,4-dihydro-2H-1,5-benzodiazepin-5-yl]-[(1R,2R)-2-nitrocyclopropyl]methanone The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H19N3O3
assistant