You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4Z)-4-[(2Z)-2-[3-hydroxy-2-(3-nitrophenyl)pyrimidin-4-ylidene]ethylidene]-2-methoxy-6-nitrocyclohexa-2,5-dien-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H14N4O7
assistant