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 8,8-difluoro-11-(2-methoxyethoxy)-15-oxa-5,6,10-triazatetracyclo[15.4.0.02,6.09,14]henicosa-1(17),2,4,9(14),10,12-hexaene-13-carbaldehyde .
user
C21H23F2N3O4
assistant