[NH:1]1[CH2:6][CH2:5][CH:4]([CH2:7][CH2:8][N:9]2[CH2:14][CH2:13][C:12]3([CH2:19][CH2:18][CH:17]([CH2:20][C:21]([O:23]CC)=[O:22])[CH2:16][CH2:15]3)[CH2:11][CH2:10]2)[CH2:3][CH2:2]1>C(O)C.ClCCl>[NH:1]1[CH2:2][CH2:3][CH:4]([CH2:7][CH2:8][N:9]2[CH2:14][CH2:13][C:12]3([CH2:15][CH2:16][CH:17]([CH2:20][C:21]([OH:23])=[O:22])[CH2:18][CH2:19]3)[CH2:11][CH2:10]2)[CH2:5][CH2:6]10.35 g (1.0 mmol) of the compound from Example 24 were hydrolized in 15 ml ethanol containing 7 drops aqueous sodium hydroxide as described for Example 23. The title acid solidified upon stirring in dichloromethane. It was filtered and dried in vacuo.
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