You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-4-[[(2R,3R,4R,5R)-5-(6-aminopurin-9-yl)-4-[[(2R,3S,4R,5R)-5-(6-aminopurin-9-yl)-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl]oxy-3-hydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl]oxy-3-hydroxyoxolan-2-yl]methyl [(2R,3R,4R,5R)-2-(6-aminopurin-9-yl)-4-hydroxy-5-(phosphonooxymethyl)oxolan-3-yl] hydrogen phosphate is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H50N20O25P4
assistant