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 (7-bromo-4-oxopyrido[1,2-a]pyrimidin-2-yl)methyl 5-(phenoxymethyl)furan-2-carboxylate .
user
C21H15BrN2O5
assistant