You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 9,21-ditert-butyl-2,5-dioxa-13,17-diazatricyclo[17.4.0.06,11]tricosa-1(19),6(11),7,9,20,22-hexaene .
user
C27H40N2O2
assistant