You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-[2-(2,6-dimethylmorpholin-4-yl)-2-oxoethyl]-1-(4-fluorophenyl)-4-methylpyrazolo[3,4-d]pyridazin-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H22FN5O3
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