You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (3S)-1-benzyl-3-hydroxy-3-[2-(3-methylphenyl)ethynyl]-7-(trifluoromethyl)indol-2-one by IUPAC nomenclature, provide its molecular formula.
user
C25H18F3NO2
assistant