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 propan-2-yl (2R)-2-[[[(2S)-5-(2,4-dioxopyrimidin-1-yl)oxolan-2-yl]methoxy-phenoxyphosphanyl]amino]propanoate .
user
C21H28N3O7P
assistant