2(R)-2-[(Z)-2-(Aminothiazol-4-yl)-2-(hydroxyimino)acetamido)]-2-[(2rs,5rs)-5-methyl-7-oxo-2,4,5,7-tetrahydro-1H-furo[3,4-d][1,3]thiazin-2-yl]acetic acid(mixture of 4 diastereomers)
2(R)-2-[(Z)-2-(Aminothiazol-4-yl)-2-(hydroxyimino)acetamido)]-2-[(2rs,5rs)-5-methyl-7-oxo-2,4,5,7-tetrahydro-1H-furo[3,4-d][1,3]thiazin-2-yl]acetic acid(mixture of 4 diastereomers)