You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[2-[(2-methylpropan-2-yl)oxy]ethyl]-6-(2-propan-2-yloxyethyl)-3,6-diazabicyclo[3.1.1]heptane is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H32N2O2
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