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-ethoxyphenyl)-2-phenyl-3-(2,3,4-trimethoxyphenyl)-3a,6a-dihydro-3H-pyrrolo[3,4-d][1,2]oxazole-4,6-dione .
user
C28H28N2O7
assistant