[NH:1]([C@@H:5]1[CH2:9][CH2:8][N:7](C(OC(C)(C)C)=O)[CH2:6]1)[C:2]([NH2:4])=[O:3]>Cl>[NH:7]1[CH2:8][CH2:9][C@@H:5]([NH:1][C:2]([NH2:4])=[O:3])[CH2:6]1(R)-tert-butyl 3-ureidopyrrolidine-1-carboxylate from step A was treated with HCl solution (in EtOAc, 30 mL) for 2 hours. The mixture was concentrated in vacuo to give the crude title compound. MS (m/z): 130 (M+H)+.
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