You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 1-[4-[[(3R,5S)-3,5-dimethyl-4-[(2-pyridin-4-ylphenyl)methyl]piperazin-1-yl]methyl]phenyl]-2-hydroxyethanone is given. What is its corresponding molecular formula?
user
C27H31N3O2
assistant