[NH2:1][C@@H:2]1[C:20](=[O:21])[N:4]2[C:5]([C:17]([OH:19])=[O:18])=[C:6]([CH2:9]OC(=O)CC(=O)C)[CH2:7][S:8][C@H:3]12.C(=O)([O-])O.[Na+].[SH:27][C:28]1[S:29][C:30]([CH3:33])=[N:31][N:32]=1>O>[NH2:1][C@@H:2]1[C:20](=[O:21])[N:4]2[C:5]([C:17]([OH:19])=[O:18])=[C:6]([CH2:9][S:27][C:28]3[S:29][C:30]([CH3:33])=[N:31][N:32]=3)[CH2:7][S:8][C@H:3]12In water (30 ml) was dissolved 7β-amino-3-(3-oxobutyryloxy)methyl-3-cephem-4-carboxylic acid (3.14 g) together- with sodium hydrogen carbonate (1.84 g) and 2-mercapto-5-methyl-1,3,4-thiadiazole (1.6 g) and the resultant solution was adjusted its pH to 6.4, followed by stirring for one hour at 60° C. After cooling, the reaction solution was washed with dichloromethane and pH of the aqueous layer was adjusted to 3.5 under ice-cooling, followed by stirring for one hour. The precipitated materials were collected by filtration and washed with water, methanol and acetone in this order, followed by drying to give 7β-amino-3-(2-methyl-1,3,4-thiadiazol-5-yl)thiomethyl-3-cephem-4-carboxylic acid (2.9 g).
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