7-Amino-3-nor-3-cephem-4-carboxylic acid



(4-aminobutyl)guanidinium sulphate

7-phenylacetamide-3-hydroxy-3-cephem-4-carboxylic acid diphenylm

α-[[[2-Furanylcarbonyl)aminol]carbonyl] aminol]benzeneacetic aci


6-methyl-4-Hydroxy-pyridinecarboxylic acid


3-Methanesulfonyl-2-oxo-imidazolidine-1-carbonyl chloride
