You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
8-[4-(2-deuteriopropan-2-yl)-1-methyl-5-propan-2-ylpyridin-1-ium-2-yl]-7-methyl-2-propan-2-yl-[1]benzofuro[2,3-b]pyridine is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H33N2O+
assistant