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 propan-2-yl 3-[[C-(4-benzyl-2,3,4a,5,7,7a-hexahydropyrrolo[3,4-b][1,4]oxazin-6-yl)-N-methylcarbonimidoyl]amino]propanoate .
user
C21H32N4O3
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