You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,5-dimethyl-12-oxa-4,6-diazatricyclo[7.2.1.02,7]dodeca-2,4,6-triene;ethane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C15H26N2O
assistant