You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(6-bromo-4-chloro-1-ethylimidazo[4,5-c]pyridin-2-yl)-2-hydroxyiminoacetonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C10H7BrClN5O
assistant