You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2R,4aR,6R,8aR)-2,4,4a,6,8,8a-hexamethyl-2,3,6,7-tetrahydro-[1,4]oxazino[3,2-b][1,4]oxazine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C12H24N2O2
assistant