You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule 6-[[tert-butyl(dimethyl)silyl]oxymethyl]-2,2-dimethyl-4-(4-methylpyrrolo[2,1-f][1,2,4]triazin-7-yl)-6,6a-dihydro-3aH-furo[3,4-d][1,3]dioxol-4-ol into molecular formula.
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C21H33N3O5Si
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