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 ethyl (2R)-2-[[[(2R,3R,4R,5R)-5-[2-amino-6-(cyclopropylamino)purin-9-yl]-4-(difluoromethyl)-4-fluoro-3-hydroxyoxolan-2-yl]methoxy-phenoxyphosphoryl]amino]propanoate .
user
C25H31F3N7O7P
assistant