4-N, 2'-N and 4,2'Di-N-fortimicins AH and AI

4-N,2'-N and 4,2'-Di-N-fortimicin AO derivatives

4-N,N-Dimethylcarbamoyloxy-6-aminopyrimidines and salts thereof,

4-N-.beta.-Lysyl-2'-N-des-.beta.-lysyl antibiotic AX-127B-1 and

4-N-Acyl, 2'-N-acyl and 4,2'-N,N'-diacylfortimicin E derivatives

4-Naphthyl and substituted naphthyl-3-hydroxy-3-pyrroline-2,5-di

4-Nitro-2-trichloromethylphenyl disulfides

4-Nitro-4'-[N-(N'-benzoyl)-ureido]-diphenyl ethers

4-Nitro-5-cyanoimidazoles as coccidiostats

4-nitrogen substituted isoquinolinol compounds having cardiotoni

4-O-(2,3,5-Trideoxy-5-amino-.alpha.-D-pentofuranosy l)-6-O-amino

4-O-(aminoglycosyl)- or 4,6-di-O-(aminoglycosyl)-2,5-dideoxy-5,5

4-OH-quinoline carboxylic acid amides having analgesic and anti-

4-Oxa and 4-thia steroids

4-oxa-1-azabicyclo [3,2,0] heptan-7-one derivatives as antitumor

4-oxo- and 4H-imidazo(5,1-c)(1,4)benzoxazines useful as benzodia

4-oxo-1,2,3-benzotriazines

4-oxo-1,4-dihydro[1,8]naphthyridine-3-carboxamides...

4-oxo-1,4-dihydro[1,8]naphthyridine-3-carboxamides...

4-oxo-1,4-dihydro-3-cinnolinecarboxamides as antiviral agents