You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (2R)-5,6,7',9'-tetrakis[5-(5-tert-butylthiophen-2-yl)thiophen-2-yl]spiro[1H-acenaphthylene-2,3'-2-thiatricyclo[6.3.1.04,12]dodeca-1(11),4(12),5,7,9-pentaene] into molecular formula.
user
C70H62S9
assistant