You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-(3-hydroxy-4-methylpiperidin-1-yl)pyrido[2,3-b]pyrazin-2-yl]-4-methylpiperidin-3-ol The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H27N5O2
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