(2S,5R,6R)-6-[[(2R)-2-[[(2R)-2-(o-Nitrophenylthioamino)-3-(N-methylcarbamoyl)propionyl]amino]-2-(p-hydroxyphenyl)acetyl]amino]-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2-carboxylic acid