You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1,3-bis[(4-chlorophenyl)methyl]-2,2-dimethyl-4-piperidin-1-yl-3H-pyridin-1-ium The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H31Cl2N2+
assistant