You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance [(1S,2R,3R,4S)-3-(dimethylamino)-4,7,7-trimethyl-2-bicyclo[2.2.1]heptanyl]-trimethylazanium .
user
C15H31N2+
assistant