[CH2:1]([CH2:3][NH2:4])[OH:2].[SH:5][CH2:6][C:7]([NH:9][C:10]1[CH:11]=[C:12]([CH:20]=[CH:21][CH:22]=1)[C:13]([NH:15][CH2:16][C:17]([OH:19])=[O:18])=[O:14])=[O:8].C(CN(CC([O-])=O)CC(O)=O)N(CC(O)=O)CC([O-])=O.[Na+].[Na+]>O1CCCC1.O>[OH:2][CH2:1][CH2:3][NH3+:4].[SH:5][CH2:6][C:7]([NH:9][C:10]1[CH:11]=[C:12]([CH:20]=[CH:21][CH:22]=1)[C:13]([NH:15][CH2:16][C:17]([O-:19])=[O:18])=[O:14])=[O:8]A solution 1.13 ml. of ethanolamine (1.15 g., 0.0188 mole) and 10 ml. of tetrahydrofuran is added to a suspension of N-[3-(mercaptoacetylamino)benzoyl]glycine (5 g., 0.0186 mole), 5 mg. of disodium edetate, 6 ml. of water, and 40 ml. of tetrahydrofuran. Warming the mixture to 40°-45° C. provides a clear solution which is first diluted with 200 ml. of tetrahydrofuran, then cooled in a dry ice-acetone bath to promote crystallization and subsequently stirring for a period of 16 hrs. at room temperature. The precipitated material formed is collected, washed with tetrahydrofuran and dried over calcium chloride to afford 5.7 g., (93% yield) of N-[3-(mercaptoacetylamino)benzoyl]glycine 2-hydroxyethyl ammonium salt, m.p. 144.0°-160.0° C. (dec.).
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