CC(OC(OC(OC(C)(C)C)=O)=O)(C)C.C[N:17]([CH2:25][C@H:26]1[CH2:29][C@H:28]([O:30]C2C=CC(CN3CCCC3)=CC=2)[CH2:27]1)[C:18](=[O:24])[O:19][C:20]([CH3:23])([CH3:22])[CH3:21].NC[C@@H]1C[C@H](O)C1.CCN(CC)CC>C1COCC1>[OH:30][C@@H:28]1[CH2:29][C@H:26]([CH2:25][NH:17][C:18](=[O:24])[O:19][C:20]([CH3:22])([CH3:21])[CH3:23])[CH2:27]1
(Boc)2O (4.42 g, 0.02 mol) was added to a solution of intermediate 9, cis-3-(aminomethyl)cyclobutanol (1.95 g, 0.019 mol) and Et3N (5.6 mL, 0.039 mol) in 20 mL absolute THF under stirring. The mixture was stirred at room temperature for 30 min, evaporated, and coevaporated with CCl4. The residue was recrystallized form ether to give the title compound (3 g, 77%) as yellow crystals. 1H NMR-data (DMSO-d6): 6.61-6.87 (m, 1H, NH); 4.85 (br.s, 1H, OH); 3.77-3.92 (m, 1H); 2.90 (t, 2H, CH2, J=6.1 Hz); 2.10-2.22 (m, 2H); 1.67-1.80 (m, 1H); 1.21-1.51 (m, 11H, CH2, Boc).
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