[CH3:1][CH:2]1[CH:6]([CH2:7][CH2:8][CH2:9][O:10]C2CCCCO2)[NH:5][C:4](=[O:17])[CH2:3]1>C(O)(=O)C.C1COCC1.O>[OH:10][CH2:9][CH2:8][CH2:7][CH:6]1[NH:5][C:4](=[O:17])[CH2:3][CH:2]1[CH3:1]A mixture of the title compound of EXAMPLE 234 is treated with acetic acid:THF:water (4:2:1), and concentrated. The resulting material is purified by column chromatography to yield the title material.
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