You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(1S,5S,6R)-2-amino-1'-methyl-2',4-dioxospiro[3-azabicyclo[3.1.0]hex-2-ene-6,3'-indole]-1,5-dicarbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H9N5O2
assistant