You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,3R,4S,5R)-2-(6-aminopurin-9-yl)-5-[[[3-[2-[6-(1-methoxy-2-methylpropan-2-yl)-1H-benzimidazol-2-yl]ethyl]cyclobutyl]-methylamino]methyl]oxolane-3,4-diol is the IUPAC name of a molecule. Please give its molecular formula.
user
C29H40N8O4
assistant