You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 2-morpholin-4-yl-N-[4-[[2-[5-(trifluoromethyl)pyridin-2-yl]sulfanylacetyl]amino]phenyl]acetamide into its molecular formula.
user
C20H21F3N4O3S
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