You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-[4-[7-ethyl-5-(3-methylphenyl)spiro[2H-indole-3,1'-cyclohexane]-1-yl]sulfonyl-2-methylphenoxy]acetic acid .
user
C31H35NO5S
assistant