You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule (3aS,4S,6S,6aS)-2,2-dimethyl-4-[4-(N-methylanilino)pyrazolo[1,5-a][1,3,5]triazin-8-yl]-3a,4,6,6a-tetrahydrofuro[3,4-d][1,3]dioxole-6-carbaldehyde into molecular formula.
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C20H21N5O4
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