You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(3S,4R,5R)-2-(2,6-diaminopurin-9-yl)-5-(hydroxymethyl)-3-methoxyoxolane-3,4-diol is the IUPAC name of a molecule. Please give its molecular formula.
user
C11H16N6O5
assistant