[6R-(6alpha,7beta)]-3-methyl-8-oxo-7-(phenylacetamido)-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 5-oxide;(6R)-3-Methyl-8-oxo-7α-[(phenylacetyl)amino]-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid 5-oxide;(7R)-3-Methyl-7-(phenylacetylamino)-4-carboxycepham-3-ene 1-oxide
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