You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(8S)-8-[bis(3-fluorophenyl)methyl]-3,5-dioxo-6-propyl-7,8-dihydropyrazino[1,2-b]pyridazin-4-yl] acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H23F2N3O4
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