(6R-(6alpha,7beta(R*)))-7-((Formyloxy)phenylacetamido)-3-(((1-methyl-1H-tetrazol-5-yl)thio)methyl)-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid 57268-80-1 EINECS 260-657-6 cefamandole nafate