You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule [(4aR,8aS)-6-methyl-3,4a,5,7,8,8a-hexahydro-2H-pyrido[4,3-b][1,4]oxazin-4-yl]-(2-fluoro-4-methoxyphenyl)methanone ?
user
C16H21FN2O3
assistant