You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(2-fluorophenoxy)-N-[2-[(2-methyl-6-morpholin-4-ylpyrimidin-4-yl)amino]ethyl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H26FN5O3
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