You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 9-[(1S,3R,4S)-3-[[tert-butyl(dimethyl)silyl]oxymethyl]-4-methyl-2-methylidenecyclopentyl]-6-phenylmethoxypurin-2-amine by IUPAC nomenclature, provide its molecular formula.
user
C26H37N5O2Si
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