You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule (7,7-dioxo-2-sulfamoyl-5,6-dihydro-4H-thieno[2,3-b]thiopyran-4-yl) 2-[(2-methylpropan-2-yl)oxycarbonylamino]acetate .
user
C14H20N2O8S3
assistant