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 10,21-dimethyl-2,13-dithia-10,21-diazoniapentacyclo[12.8.0.03,12.04,9.015,20]docosa-1(14),3(12),4,6,8,10,15,17,19,21-decaene .
user
C20H16N2S2+2
assistant