You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-2-[(4-methyl-5-phenyl-1,2,4-triazol-3-yl)sulfanyl]-N-[2-(trifluoromethyl)phenyl]propanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H17F3N4OS
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