英文别名PF-03709270; PF 03709270; ulopenem etzadroxil; ((2-ethylbutanoyl)oxy)methyl (5R,6S)-6-((R)-1-hydroxyethyl)-3-(((1R,3S)-1-oxidotetrahydrothiophen-3-yl)thio)-7-oxo-4-thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylate; 4-Thia-1-azabicyclo[3.2.0]hept-2-ene-2-carboxylic acid, 6-[(1R)-1-hydroxyethyl]-7-oxo-3-[[(1R,3S)-tetrahydro-1-oxido-3-thienyl]thio]-, (2-ethyl-1-oxobutoxy)methyl ester, (5R,6S)- 
