3-{[(7aR,7R)-3-{[(5-methyl-1,3,4-thiadiazol-2-yl)sulfanyl]methyl}-6-oxo-7-{[2-(1,2,3,4-tetraazol-1-yl)acetyl]amino}-2,6,7,7a-tetrahydroazeto[2,1-b][1,3]thiazin-4-yl]carbonyl}-2-(carboxy{[2-(1,2,3,4-tetraazol-1-yl)acetyl]amino}methyl)-5-{[(5-methyl-1,3,4-thiadiazol-2-yl)sulfanyl]methyl}-6H,2H,3H-1,3-thiazine-4-carboxylic acid