You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-[3-[(4aR,6R,7aS)-2-amino-6-methoxy-4a,5,6,7-tetrahydro-4H-cyclopenta[d][1,3]thiazin-7a-yl]-4-fluorophenyl]-5-chloropyridine-2-carboxamide;methane into its molecular formula.
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C21H24ClFN4O2S
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