You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[4-(3,4-difluorophenyl)piperidin-3-yl]-5,6,7,8-tetrahydroimidazo[1,2-a]pyridine-2-sulfonamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H22F2N4O2S
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