You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-7-(azetidin-3-ylamino)-1,5-dimethyl-2-propan-2-yl-2,4-dihydropyrido[3,4-b]pyrazin-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H23N5O
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