You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2-methoxyethyl)-2-[(3-methyl-1,2,4-thiadiazol-5-yl)sulfanyl]-5,6,7,8-tetrahydro-[1]benzothiolo[2,3-d]pyrimidin-4-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H18N4O2S3
assistant