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(2R,3S,4E)-3-(Tert-Butoxycarbonylamino)-2-hydroxy-4-hexenoic acid [(2aR,11S)-12bbeta-(acetyloxy)-12beta-benzoyloxy-2abeta,3,4,4a,5,6,9,10,11,12,12abeta,12b-dodecahydro-4alpha,6alpha-dihydroxy-4aalpha,8,13,13-tetramethyl-5-oxo-10alpha,11-(carbonylbisoxy)-7


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