You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(1Z,3E)-3-(4-cyanophenyl)-6,15-dimethyl-5,8,13,16,17,18-hexathiatricyclo[12.2.1.14,7]octadeca-1,3,6,14-tetraen-2-yl]benzonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H22N2S6
assistant