You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3S)-3-(6-methylpyrazin-2-yl)piperidin-1-yl]-[3-(1,2,4-triazol-4-yl)phenyl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20N6O
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