You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4aR,7aS)-6-methyl-3,4,4a,5,7,7a-hexahydro-2H-pyrrolo[3,4-b][1,4]oxazine is the IUPAC name of a molecule. Please give its molecular formula.
user
C7H14N2O
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