Synonyms: 1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylicacid,3-[(6,7-dihydro-5H-pyrrolo[1,2-a]imidazol-6-yl)thio]-6-(1-hydroxyethyl)-4-methyl-7-oxo-,monosodium salt, [4R-[3(S*),4a,5b,6b(R*)]]-; 1-Azabicyclo[3.2.0]hept-2-ene-2-carboxylicacid,3-[[(6S)-6,7-dihydro-5H-pyrrolo[1,2-a]imidazol-6-yl]thio]-6-[(1R)-1-hydroxyethyl]-4-methyl-7-oxo-,monosodium salt, (4R,5S,6S)- (9CI); DU 6681a