You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule [[(2R,3R,5R)-5-[2-chloro-6-(naphthalen-1-ylmethylamino)purin-9-yl]-3,4-dihydroxyoxolan-2-yl]methoxy-hydroxyphosphoryl]methylphosphonic acid .
user
C22H24ClN5O9P2
assistant