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 (3R,3aR,6aS)-5-(4-chlorophenyl)-3-(4-methoxyphenyl)-2,3a-diphenyl-3,6a-dihydropyrrolo[3,4-d][1,2]oxazole-4,6-dione .
user
C30H23ClN2O4
assistant