You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-[(2R,3R,4R,5S)-4-amino-3-fluoro-5-(trityloxymethyl)oxolan-2-yl]-N,N-dimethylpurin-6-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C31H31FN6O2
assistant