You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-tert-butyl-6-imino-4-pyridin-3-yl-4,5-dihydro-2H-pyrano[2,3-c]pyrazole-5-carbonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H17N5O
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