You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2S,3S,4S,5R)-4,5,6-triacetyloxy-2-[[(2R,3R,4S)-3,4-bis(phenylmethoxy)-2-(phenylmethoxymethyl)selenolan-1-ium-1-yl]methyl]oxan-3-yl] acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H47O12Se+
assistant