You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1S,3R,6S,7S,8R,10S,12R)-7-benzyl-1,11,11-trimethyl-5-phenyl-2-oxa-5-azatetracyclo[6.5.0.03,6.010,12]tridecan-4-one into its molecular formula.
user
C27H31NO2
assistant