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 (3S,3aS,4R,5R,5aS,6S,8aR,8bR)-6-methyl-4-nitro-3,5-diphenyl-2,3,3a,4,5,6,8a,8b-octahydro-1H-acenaphthylene-5a-carbaldehyde .
user
C26H27NO3
assistant