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 1-[(7R,8aR)-2-benzoyl-7-hydroxyspiro[1,3,6,7,8,8a-hexahydropyrrolo[1,2-a]pyrazine-4,3'-azetidine]-1'-yl]-2-phenylethanone ?
user
C24H27N3O3
assistant