You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-6-[4-chloro-2-[(3E)-2-fluorohexa-1,3,5-trien-3-yl]sulfonylphenyl]sulfonyl-6-azaspiro[2.5]octan-2-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H22ClFN2O4S2
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