You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(Z)-[2-methyl-1-[(5-nitropyridin-2-yl)diazenyl]butylidene]amino]-phenylazanide;nickel The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H17N6NiO2-
assistant