P([O-])([O-])([O-])=O.C([O-])(O)=O.[Na+].[OH:11][C:12]1[CH:19]=[C:18]([OH:20])[CH:17]=[CH:16][C:13]=1[C:14]#[N:15].O.Cl.N[C@H:24]([C:27]([OH:29])=[O:28])[CH2:25][SH:26]>CO>[OH:11][C:12]1[CH:19]=[C:18]([OH:20])[CH:17]=[CH:16][C:13]=1[C:14]1[S:26][CH2:25][CH:24]([C:27]([OH:29])=[O:28])[N:15]=1In a mixed solvent including methanol (30 mL) and phosphate buffer solution (20 mL), NaHCO3 (466 mg, 5.55 mmol) was carefully added to a solution including the obtained Compound 101a (0.5 g, 3.70 mmol) and L-cysteine hydrochloride monohydrate (974 mg, 5.55 mmol), and the reaction mixture was refluxed for 10 hours. After methanol was evaporated, the reaction mixture was acidified by using 1 N HCl to increase a pH to 2. The resultant precipitate was filtered, and washed with water to obtain Compound 101b (613 mg, 69%).
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