You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule 7-methyl-2-(6-nitro-1,3-benzodioxol-5-yl)-2,3,5,6,7,8-hexahydro-1H-[1]benzothiolo[2,3-d]pyrimidin-4-one into molecular formula.
user
C18H17N3O5S
assistant