You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-(benzenesulfonyl)-3-cyclohexyl-4-methyl-3,5,8,10-tetrazatricyclo[7.3.0.02,6]dodeca-1,4,6,8,11-pentaene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H22N4O2S
assistant