You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 15,19-dimethyl-11-oxa-15,19-diazaheptacyclo[14.11.0.02,14.04,12.05,10.018,26.020,25]heptacosa-1(27),2(14),3,5,7,9,12,16,18(26),20(25),23-undecaene .
user
C26H20N2O
assistant