3-Ethyl- and 3-(2'cyanoethyl)-cephalosporins

3-Ethyl-1,3-dihydro-3-methoxy-2H-indole 2-one

3-Fluoro-3-nitrooxetane

3-Fluoro-D-alanine and pharmacologically acceptable esters, and

3-Formyl-4-methyl-pentanoic acids

3-Formylchromones

3-Furyl alkyl disulfides

3-Furyl beta-chalcogencycloaklyl sulfides

3-Furyl chalcogen alkyl sulfides

3-Halo cephalosporins

3-Halo-2,6-dinitro-4-trifluoromethylaniline

3-Halo-2,6-dinitro-4-trifluoromethylanilines

3-Halo-cephalosporins

3-Halo-cepham derivatives

3-Halogeno-6-hydroxy-pyridone-(2) azo dyestuffs

3-Halomethylcarbonyl-9-benzoyl-1,2,3,4-tetrahydrocarbazoles

3-Hetero acyl-2,3-benzoxazepines

3-Hetero-5-substituted aminophenyloxadiazoles

3-Heterocyclic thiomethylcephalosporins

3-Heterocyclicthiomethylcephalosporins