You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-3-[4-methoxy-2-[2-methyl-3-[methyl-bis(trimethylsilyloxy)silyl]propyl]phenyl]prop-2-enoic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H38O5Si3
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