[C:1]([S:5][CH2:6][C:7]1([CH3:14])[NH:11][C:10](=[O:12])[NH:9][C:8]1=[O:13])([CH3:4])([CH3:3])[CH3:2].[OH-:15].[Ca+2].[OH-]>O>[C:10]([NH:11][C@:7]([CH3:14])([C:8]([OH:15])=[O:13])[CH2:6][S:5][C:1]([CH3:4])([CH3:3])[CH3:2])(=[O:12])[NH2:9]First, 5-tert-butylthiomethyl-5-methylhydantoin (purity content 10.82 g, 50.0 mmol) was mixed with calcium hydroxide (3.70 g, 50.0 mmol), and water (60 g), and the mixture was heated to 100° C. and stirred for 3.5 hours. The HPLC analysis of the reaction solution showed the production of the title compound in a reaction yield of 25%.
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