132015-04-4 4-Oxa-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid, 6-(1-hydroxyethyl)-7-oxo-3-phenyl-, (5R-(5alpha,6alpha(R*)))- 6-(1-Hydroxyethyl)-2-phenyl-1-oxa-2-penem-3-carboxylic acid HP-1-Oxapenem