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 (2R)-N-(furan-2-ylmethyl)-2-[4-oxo-3-[[(2R)-oxolan-2-yl]methyl]quinazolin-2-yl]sulfanylpropanamide .
user
C21H23N3O4S
assistant