You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name (8aS)-4-benzhydryl-2-[[2-chloro-5-(trifluoromethyl)phenyl]methyl]-3,4,6,7,8,8a-hexahydro-1H-pyrrolo[1,2-a]pyrazine ?
user
C28H28ClF3N2
assistant