You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-methyl-11-propan-2-yl-10-oxa-2,4-diazatricyclo[7.3.0.03,7]dodeca-1(9),2,7-triene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C13H18N2O
assistant