You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(5-pyrazin-2-ylpyridin-2-yl)-4-[[(3S)-pyrrolidin-3-yl]amino]cyclohexan-1-ol is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H25N5O
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