You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 3-ethylsulfanyl-7-(trifluoromethyl)-2-[5-(trifluoromethyl)pyridin-2-yl]imidazo[1,2-a]pyridine by IUPAC nomenclature, provide its molecular formula.
user
C16H11F6N3S
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