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 4-(2,3,4a,5,6,7,8,8a-octahydrobenzo[b][1,4]oxazin-4-yl)-2-(methylamino)butanenitrile using the IUPAC nomenclature.
user
C13H23N3O
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