You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(1R)-1-cyclobutylethyl]-7-[(4-methylcyclohexyl)methyl]-8-[(3R)-3-phenylmorpholin-4-yl]-2-(2,2,2-trifluoroethylsulfanyl)-9H-purin-7-ium-6-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C31H42F3N6OS+
assistant