You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 3-[3-(2-cyanoethyl)-4-oxo-7-[4-(trifluoromethyl)phenyl]spiro[chromene-2,1'-cyclobutane]-3-yl]propanenitrile .
user
C25H21F3N2O2
assistant