You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
6-(6-chloropyridin-3-yl)-2,7-diphenyl-3-(pyridin-3-ylmethyl)-3-azatricyclo[5.1.1.01,5]nonane is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H28ClN3
assistant