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What is the molecular formula of the molecule identified by [(2S,3S)-7-ethyl-4-methoxy-13,15-dioxa-7-azatetracyclo[8.7.0.02,6.012,16]heptadeca-1(17),4,10,12(16)-tetraen-3-yl] 2-(3-hydroxy-3-methylbutoxy)propanoate ?
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