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 2-methyl-1-[(2R,5S)-5-(2-methylpyridin-1-ium-1-yl)hexan-2-yl]pyridin-1-ium .
user
C18H26N2+2
assistant