You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(9,9-dioctylfluoren-2-yl)-5-methyl-8-(7-methyl-4,5-dioctylthieno[3,2-g][1]benzothiol-2-yl)-3-(9-methyl-9-octylfluoren-2-yl)quinoxaline is the IUPAC name of a molecule. Please give its molecular formula.
user
C87H112N2S2
assistant