B. (Z)-2-(2-amino-1,3-thiazol-4-yl)-N-[(5aR,6R)-1,7-dioxo-1,4,6,7-tetrahydro-3H,5aH-azeto[2,1-b]furo[3,4-d][1,3]thiazin-6-yl]-2-(methoxyimino)acetamid,
B. (Z)-2-(2-amino-1,3-thiazol-4-yl)-N-[(5aR,6R)-1,7-dioxo-1,4,6,7-tetrahydro-3H,5aH-azeto[2,1-b]furo[3,4-d][1,3]thiazin-6-yl]-2-(methoxyimino)acetamid,