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,6R,8aS)-4-[(4-imidazol-1-yl-2-methylphenyl)methyl]-6-methoxy-2,3,4a,5,6,7,8,8a-octahydrobenzo[b][1,4]oxazine using the IUPAC nomenclature.
user
C20H27N3O2
assistant