You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-[(5S)-5-ethyl-2,5-dimethyl-3,4,4a,10b-tetrahydropyrano[3,2-c]chromen-2-yl]prop-2-ynyl]-1-methylpiperidin-1-ium;iodide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H36INO2
assistant