You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (1R,5S)-1,3,3-trimethyl-6-(1-methylpyridin-1-ium-2-yl)-6-azabicyclo[3.2.1]octane ?
user
C16H25N2+
assistant