You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-N-(9-methyl-9-azabicyclo[3.3.1]nonan-3-yl)imidazo[1,2-a]pyrazine-6,8-diamine is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H22N6
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