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 (8S)-8-(2,4-dimethoxyphenyl)-3-(furan-2-ylmethyl)-6-oxo-2,4,7,8-tetrahydropyrido[2,1-b][1,3,5]thiadiazine-9-carbonitrile ?
user
C21H21N3O4S
assistant