You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule ethyl (4S)-6-[[(2S)-5-chloro-2,3-dihydro-1-benzofuran-2-carbonyl]oxymethyl]-2-oxo-4-thiophen-2-yl-3,4-dihydro-1H-pyrimidine-5-carboxylate ?
user
C21H19ClN2O6S
assistant