You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named (1R,9S,11R,15S,16S)-10-ethyl-14-methyl-3-(4-methyl-5-oxooxolan-2-yl)-12-oxa-4-azatetracyclo[7.6.1.04,16.011,15]hexadecan-13-one is given. What is its corresponding molecular formula?
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C22H33NO4
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