You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[1-(6-tert-butyl-1,1-dimethyl-2,3-dihydroinden-4-yl)ethenyl]thiophene-2-carboxylic acid is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H26O2S
assistant