You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule N-[[(3R)-2,3-dihydro-1,4-benzodioxin-3-yl]methyl]-2-[(5,7-dimethyl-[1,2,4]triazolo[1,5-a]pyrimidin-2-yl)sulfanyl]acetamide into molecular formula.
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C18H19N5O3S
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