You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [4-[(1R,2R,6S,7R)-4-(2-methoxy-5-nitrophenyl)-3,5-dioxo-4,8,9-triazatricyclo[6.4.0.02,6]dodeca-9,11-diene-7-carbonyl]phenyl] acetate by IUPAC nomenclature, provide its molecular formula.
user
C25H20N4O8
assistant