- [[[Imidazolidinyl amino]carbonyl]amino]acetyl cephalosporin derivatives
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[[[Imidazolidinyl amino]carbonyl]amino]acetylcephalosporin derivatives having the formula STR1 wherein R is hydrogen, lower alkyl, phenyl-lower alkyl, diphenyl-lower alkyl, tri(lower alkyl)silyl, trihaloethyl, a salt forming ion, or the group STR2 R1
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