You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-(4-tert-butylcyclohexa-1,5-dien-1-yl)-1H-pyrazolo[1,5-a]pyrimidin-7-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H19N3O
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