You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-amino-7-(3-amino-2-hydroxypropyl)-9-[(3R,4S)-3,4-dihydroxy-5-(hydroxymethyl)oxolan-2-yl]-1H-purine-6,8-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H20N6O7
assistant