You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[3-ethyl-3-(prop-2-enoxymethyl)-1,5,7,11-tetraoxaspiro[5.5]undecan-9-yl]methyl-dimethyl-phenylsilane is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H34O5Si
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