You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (2R,3S,4R,5R,8R,10S,12R,13R,14R)-2-ethyl-3,4,10,12-tetrahydroxy-10-iodo-13-[(2S,4S,6S)-4-methoxy-4,6-dimethyloxan-2-yl]oxy-3,5,6,8,14-pentamethyl-1-oxa-6-azacyclopentadecan-15-one by IUPAC nomenclature, provide its molecular formula.
user
C28H52INO9
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