7-(2 (2-Aminothiazol-4-yl)-2-hydroxyiminoacetamido)-3-vinyl-3-cephem-4-carboxylic acid
5-Thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid, 7-(((2Z)-2-(2-amino-4-thiazolyl)-2-(hydroxyimino)-1-oxoethyl)amino)-3-ethenyl-8-oxo-, (6R,7R)-