You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-(5-aminopyrazin-2-yl)-3-fluorophenyl]-N-[(3R)-pyrrolidin-3-yl]benzenesulfonamide;sulfane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H22FN5O2S2
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