You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2E)-2-[(7S)-7-[(E)-5,5-dimethylnon-7-enyl]-6,6-dimethoxy-7-methyloxepan-3-ylidene]acetaldehyde is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H38O4
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