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 (1R,5S,6R)-3-methyl-1,5,6-triphenylspiro[3-azabicyclo[3.1.0]hexane-2,2'-indene]-1',3'-dione .
user
C32H25NO2
assistant