You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-cyano-7-hydroxy-9,9-dimethyl-3-oxo-1-thiaspiro[4.5]dec-6-ene-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C13H16N2O3S
assistant