You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (4aS)-2,4,4a,5,6,11-hexahydro-1H-[1,4]oxazino[3,4-c][1,4]benzodiazepine using the IUPAC nomenclature.
user
C12H16N2O
assistant