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(2R,3S)-2-Hydroxy-3-(tert-butoxycarbonylamino)-3-phenylpropanoic acid 1,14beta-(carbonylbisoxy)-2alpha-(benzoyloxy)-4-acetoxy-5beta,20-epoxy-7beta-methoxy-9-oxo-10beta-(dimethylcarbamoyloxy)taxa-11-ene-13alpha-yl ester


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