You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 5-(3-methylthiophene-2-carbonyl)-N-(pyridin-4-ylmethyl)-5-azaspiro[2.4]heptane-2-carboxamide;2,2,2-trifluoroacetic acid into its molecular formula.
user
C21H22F3N3O4S
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