You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (5-chloro-2-fluorophenyl)-[8-[(4-methylpiperazin-1-yl)methyl]-5,5-dioxo-5lambda6-thia-2-azaspiro[3.4]octan-2-yl]methanone into its molecular formula.
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C19H25ClFN3O3S
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