(+)-(5R,6S)-6-((1R)-1-Hydroxyethyl)-7-oxo-3-((2R)-tetrahydro-2-furyl)-4-thia-1-azabicyclo(3.2.0)hept-2-ene-2-carboxylic acid 106560-14-9 Fropenem Fropenem [INN]