Synonyms: 5-Thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylicacid,7-[[(2-amino-4-thiazolyl)(methoxyimino)acetyl]amino]-8-oxo-3-[(1,2,3-thiadiazol-5-ylthio)methyl]-,1-[(ethoxycarbonyl)oxy]ethyl ester, [6R-[6a,7b(Z)]]-; 1,2,3-Thiadiazole,5-thia-1-azabicyclo[4.2.0]oct-2-ene-2-carboxylic acid deriv.; CL 118673