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 propan-2-yl 2-[[[(2R,5R)-5-(6-aminopurin-9-yl)-4-fluoro-2,5-dihydrofuran-2-yl]oxymethyl-phenoxyphosphoryl]amino]butanoate .
user
C23H28FN6O6P
assistant