You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the molecule identified by methyl (1R,1'S,2S,2'S,4'S,6R,7S)-1'-cyano-4'-ethenyl-2'-(4-methoxyphenyl)-3,5-dioxo-4-phenylspiro[4-azatricyclo[5.2.1.02,6]dec-8-ene-10,3'-cyclopentane]-1'-carboxylate ?
user
C31H28N2O5
assistant