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)-4-(4-chlorophenyl)-6-[[5-(3-methoxyphenyl)tetrazol-2-yl]methyl]-2-oxo-3,4-dihydro-1H-pyrimidine-5-carboxylate ?
user
C22H21ClN6O4
assistant