(7aR,7R)-7-({[(7aR,7R)-7-{[(2Z)-2-{2-[(aminocarbonyl)amino]-1,3-thiazol-4-yl}-1-oxopent-2-enyl]amino}-4-(6,6-dimethyl-1,5-dioxo-2,4-dioxahept-1-yl)-6-oxo-2,6,7,7a-tetrahydroazeto[2,1-b][1,3]thiazin-3-yl]methyl}amino)-3-[(carbamoyloxidanyl)methyl]-6-oxo-2,6,7,7a-tetrahydroazeto[2,1-b][1,3]thiazine-4-carboxylic acid