You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R)-N-(2,6-dimethylphenyl)-2-[[7-(2-methoxyphenyl)-8-oxo-[1,2,4]triazolo[4,3-a]pyrazin-3-yl]sulfanyl]butanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C24H25N5O3S
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