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methyl (2S)-2-({[(2S,3S,4S,5R,6R)-6-{[(2S,3R,4S,5S,6S)-6-{[(1S)-1-benzyl-2-methoxy-2-oxoethyl]carbamoyl}-2-{[(3S,4aR,6aR,6bS,8aS,11S,12aR,14aR,14bS)-11-{[(1S)-1-benzyl-2-methoxy-2-oxoethyl]carbamoyl}-4,4,6a,6b,8a,11,14b-heptamethyl-14-oxo-1,2,3,4,4a,5,6,6