You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-(21-methyl-20-phenyl-11-oxa-20-azaheptacyclo[15.11.0.02,14.04,12.05,10.019,27.021,26]octacosa-1,3,5,7,9,12,14,16,18,23,25,27-dodecaen-15-yl)-N,N-diphenylaniline is the IUPAC name of a molecule. Please give its molecular formula.
user
C51H36N2O
assistant