You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-[1-(5-tert-butyl-1,3,3a,4,6,6a-hexahydrofuro[3,4-c]pyrrol-4-yl)-2-methylpropan-2-yl]-3,4a,5,6,7,7a-hexahydro-2H-cyclopenta[b][1,4]oxazine .
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C21H38N2O2
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