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 [(2R,3R,4R,5R)-4-hydroxy-5-[2-oxo-4-(propanoylamino)pyrimidin-1-yl]-4-propanoyl-3-propanoyloxyoxolan-2-yl]methyl propanoate .
user
C21H29N3O9
assistant