You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-fluoro-N-[6-[2-(4-fluorophenyl)-2-oxoethyl]sulfanylpyridazin-3-yl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H13F2N3O2S
assistant