You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 2-[(1S)-1-[(2R)-2-ethylmorpholin-4-yl]ethyl]-5,6-dimethyl-3H-thieno[2,3-d]pyrimidin-4-one ?
user
C16H23N3O2S
assistant