(6R-(6alpha,7beta(Z)))-3-(Acetoxymethyl)-7-((2-(formylamino)thiazol-4-yl)(methoxyimino)acetamido)-8-oxo-5-thia-1-azabicyclo(4.2.0)oct-2-ene-2-carboxylic acid 66403-32-5 EINECS 266-341-4