(6R,7R)-3-[(Acetyloxy)methyl]-7-[[(R)-amino(4-hydroxyphenyl)acetyl]amino]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid

[6R-[6alpha,7beta(R*)]]-3-(acetoxymethyl)-7-[amino(4-hydroxyphenyl)acetamido]-8-oxo-5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid