Cl.C(OC([NH:9][C@@H:10]([CH3:28])[C:11]([NH:13][C@@:14]1([C:25]([OH:27])=[O:26])[CH2:21][C:18]2([CH2:20][CH2:19]2)[C@@H:17]2[C@H:15]1[C@H:16]2[C:22]([OH:24])=[O:23])=[O:12])=O)(C)(C)C.[OH-].[Na+]>CC(C)=O.O>[NH2:9][C@@H:10]([CH3:28])[C:11]([NH:13][C@@:14]1([C:25]([OH:27])=[O:26])[CH2:21][C:18]2([CH2:19][CH2:20]2)[C@@H:17]2[C@H:15]1[C@H:16]2[C:22]([OH:24])=[O:23])=[O:12]Add concentrated hydrochloric acid (36.94 mL, 430.11 mmol) to a solution of (1S,2S,5R,6S)-2-[[(2S)-2-(tert-butoxycarbonylamino)propanoyl]amino]spiro[bicyclo[3.1.0]hexane-4,1′-cyclopropane]-2,6-dicarboxylic acid (82.24 g, 215.06 mmol) in acetone (822.4 mL), and stir the mixture at 50° C. After 1.5 hours cool the mixture to 0° C. and add 50% sodium hydroxide in water to pH=3.6-3.8. Stir the solid obtained for 1 hour, filter and wash with water. Dry under vacuum for 48 hours to yield the title compound as a white solid (36 g, 127.53 mmol). MS (m/z): 283 (M+1).
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