(7aR,7R)-7-{[(2Z)-2-[2-({[(7aR,7R)-7-{[(2Z)-2-(2-amino-1,3-thiazol-4-yl)-2-(hydroxyimino)acetyl]amino}-6-oxo-3-vinyl-2,6,7,7a-tetrahydroazeto[2,1-b][1,3]thiazin-4-yl]carbonyl}amino)-1,3-thiazol-4-yl]-2-(hydroxyimino)acetyl]amino}-6-oxo-3-vinyl-2,6,7,7a-tetrahydroazeto[2,1-b][1,3]thiazine-4-carboxylic acid