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 (5aR,8aR)-1-benzyl-7-(2-phenoxyacetyl)-4,5,5a,6,8,8a-hexahydro-3H-pyrrolo[3,4-b]azepin-2-one .
user
C23H26N2O3
assistant