4-Thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 3-((acetyloxy)methyl)-6-(1-hydroxyethyl)-7-oxo-, (5R-(5alpha,6alpha(R*)))- 6-Heapc 6-alpha-Hydroxyethyl-2-acetoxymethyl-2-penem-3-carboxylic acid 83572-65-0