132015-05-5 4-Oxa-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 6-(1-hydroxyethyl)-3-(1-methylethyl)-7-oxo-, (5R-(5alpha,6alpha(R*)))- 6-(1-Hydroxyethyl)-2-isopropyl-1-oxa-penem-3-carboxylic acid HI-1-Oxapenem