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 [hydroxy-[[(2R,3S,5S)-3-hydroxy-5-[6-(methylamino)purin-9-yl]oxan-2-yl]methoxy]phosphoryl] phosphono hydrogen phosphate .
user
C12H20N5O12P3
assistant