You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-ethyl-4-thiophen-2-yl-6-(trifluoromethyl)-1,4-dihydropyridazine-5-carboxylic acid by IUPAC nomenclature, provide its molecular formula.
user
C12H11F3N2O2S
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