You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1-methyl-3-oxido-3-[5-(trifluoromethyl)-1,3,4-thiadiazol-2-yl]imidazolidin-3-ium-4-yl] 4-fluorobenzoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C14H12F4N4O3S
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