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 (3S)-1-ethyl-4'-[hydroxy-(4-methoxyphenyl)methylidene]-1'-(3-morpholin-4-ylpropyl)spiro[indole-3,5'-pyrrolidine]-2,2',3'-trione .
user
C28H31N3O6
assistant