You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by (Z)-4-oxo-4-[[6-(6-pyridin-2-yl-1,2,4,5-tetrazin-3-yl)pyridin-3-yl]amino]but-2-enoic acid ?
user
C16H11N7O3
assistant