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(1S,2R,3S,5R,6R,7S,8R,10R,11S,14R,15S,18R)-10-(benzoyloxy)-13,14-dibenzyl-18-(2-(trimethylsilyl)ethoxy)-6,7-dihydroxy-5,7,16,17-tetramethyl-12-oxo-13-aza-19-oxapentacyclo<9.7.02,10.03,8.011,15>nonadec-16-ene 6,7-acetonide