You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2R)-N-(2,5-dimethylphenyl)-2-[(4-methyl-1,2,4-triazol-3-yl)sulfanyl]-2-phenylacetamide into molecular formula.
user
C19H20N4OS
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