You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-methyl-7-naphthalen-2-yl-3,11-dithiatricyclo[6.3.0.02,6]undeca-1(8),2(6),4,9-tetraene is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H14S2
assistant