(2R)-2-((R)-(2-(2-aminothiazol-4-yl)acetamido)(carboxy)methyl)-5-(((1-(2-(dimethylamino)ethyl)-1H-tetrazol-5-yl)thio)methyl)-5,6-dihydro-2H-1,3-thiazine-4-carboxylic acid
(2R)-2-((R)-(2-(2-aminothiazol-4-yl)acetamido)(carboxy)methyl)-5-(((1-(2-(dimethylamino)ethyl)-1H-tetrazol-5-yl)thio)methyl)-5,6-dihydro-2H-1,3-thiazine-4-carboxylic acid