You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (2R,3S,4R,5R)-4-amino-2-(hydroxymethyl)-5-[6-(naphthalen-2-ylamino)purin-9-yl]oxolan-3-ol .
user
C20H20N6O3
assistant