You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 2-[4-(2-fluorophenyl)sulfonylpiperazin-1-ium-1-yl]-1-[(3S)-3-methylpiperidin-1-yl]ethanone into molecular formula.
user
C18H27FN3O3S+
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