1-Azabicyclo(3.2.0)hept-3-ene-2-carboxylic acid, 3-((2-aminoethyl)thio)-6-(1-hydroxyethyl)-7-oxo-, (2S-(2alpha,5alpha,6alpha(S*)))- 77171-32-5 delta(1)-Thienamycin delta1-Thienamycin