B. kyselina 2- {[(Z)-1-(2-aminothiazol-4-yl)-2-[[(2R,5RS)-5-methyl-7-oxo-1,2,5,7-tetrahydro-4H-furo[3,4-d][1,3] thiazin-2-yl]methylamino]-2-oxoethyliden]aminooxy} octová,