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 4-[(6R)-5-methoxycarbonyl-4-methyl-6-naphthalen-2-yl-2-oxo-1,6-dihydropyrimidin-3-yl]butanoate .
user
C21H21N2O5-
assistant