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,4R,5R)-5-[2-amino-6-(methylamino)purin-9-yl]-4-ethynyl-4-fluoro-3-hydroxyoxolan-2-yl]methyl dihydrogen phosphate .
user
C13H16FN6O6P
assistant