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 ethyl (4R)-6-[[4-(dimethylamino)benzoyl]oxymethyl]-2-oxo-4-thiophen-2-yl-3,4-dihydro-1H-pyrimidine-5-carboxylate .
user
C21H23N3O5S
assistant